| 1984-04-02 | vs CHA | 1 | L 2-5 | 0-1 | 1 | 51,333 | Scott McGregor | LaMarr Hoyt | LaMarr Hoyt | Scott McGregor | Britt Burns | 2 | 5 | -3 |
| 1984-04-06 | @ MIN | 2 | L 4-9 | 0-2 | 6 | 8,644 | Mike Boddicker | Mike Smithson | Mike Smithson | Mike Boddicker | | 6 | 14 | -8 |
| 1984-04-07 | @ MIN | 3 | L 4-13 | 0-3 | 6 | 10,245 | Mike Flanagan | John Butcher | John Butcher | Mike Flanagan | | 10 | 27 | -17 |
| 1984-04-08 | @ MIN | 4 | L 3-7 | 0-4 | 6 | 13,286 | Jim Palmer | Albert Williams | Albert Williams | Jim Palmer | Ron Davis | 13 | 34 | -21 |
| 1984-04-10 | vs KCA | 5 | W 6-3 | 1-4 | 6 | 18,000 | Scott McGregor | Paul Splittorff | Scott McGregor | Paul Splittorff | Storm Davis | 19 | 37 | -18 |
| 1984-04-11 | vs KCA | 6 | L 2-5 | 1-5 | 6 | 19,886 | Mike Boddicker | Larry Gura | Larry Gura | Mike Boddicker | Dan Quisenberry | 21 | 42 | -21 |
| 1984-04-14 | @ CLE | 7 | L 2-8 | 1-6 | 7 | 57,114 | Scott McGregor | Rick Sutcliffe | Rick Sutcliffe | Scott McGregor | | 23 | 50 | -27 |
| 1984-04-15 | @ CLE | 8 | W 6-5 | 2-6 | 7 | 10,008 | Storm Davis | Neal Heaton | Sammy Stewart | George Frazier | | 29 | 55 | -26 |
| 1984-04-16 | @ CLE | 9 | L 3-4 | 2-7 | 7 | 4,741 | Mike Flanagan | Bert Blyleven | Bert Blyleven | Mike Flanagan | Ernie Camacho | 32 | 59 | -27 |
| 1984-04-17 | @ TOR | 10 | L 2-3 | 2-8 | 7 | 35,602 | Mike Boddicker | Doyle Alexander | Jimmy Key | Tippy Martinez | Dennis Lamp | 34 | 62 | -28 |
| 1984-04-18 | @ TOR | 11 | L 1-7 | 2-9 | 7 | 13,489 | Jim Palmer | Dave Stieb | Dave Stieb | Jim Palmer | | 35 | 69 | -34 |
| 1984-04-19 | @ TOR | 12 | L 1-2 | 2-10 | 7 | 14,323 | Scott McGregor | Jim Clancy | Jim Clancy | Scott McGregor | | 36 | 71 | -35 |
| 1984-04-20 | vs MIN | 13 | W 4-2 | 3-10 | 7 | 21,482 | Storm Davis | Frank Viola | Sammy Stewart | Ron Davis | | 40 | 73 | -33 |
| 1984-04-21 | vs MIN | 14 | W 5-3 | 4-10 | 6 | 27,152 | Mike Flanagan | Mike Smithson | Mike Flanagan | Mike Smithson | Tippy Martinez | 45 | 76 | -31 |
| 1984-04-22 | vs MIN | 15 | L 1-6 | 4-11 | 7 | 16,560 | Mike Boddicker | John Butcher | John Butcher | Mike Boddicker | | 46 | 82 | -36 |
| 1984-04-23 | @ CHA | 16 | L 6-7 | 4-12 | 7 | 16,939 | Jim Palmer | Tom Seaver | Britt Burns | Tippy Martinez | | 52 | 89 | -37 |
| 1984-04-24 | @ CHA | 17 | W 8-3 | 5-12 | 7 | 20,035 | Scott McGregor | Richard Dotson | Scott McGregor | Richard Dotson | | 60 | 92 | -32 |
| 1984-04-25 | @ KCA | 18 | L 2-3 | 5-13 | 7 | 15,716 | Storm Davis | Larry Gura | Dan Quisenberry | Tippy Martinez | | 62 | 95 | -33 |
| 1984-04-26 | @ KCA | 19 | W 11-3 | 6-13 | 7 | 16,585 | Mike Flanagan | Danny Jackson | Mike Flanagan | Danny Jackson | | 73 | 98 | -25 |
| 1984-04-27 | vs TEX | 20 | W 4-3 | 7-13 | 7 | 35,629 | Mike Boddicker | Danny Darwin | Sammy Stewart | Dave Tobik | | 77 | 101 | -24 |
| 1984-04-28 | vs TEX | 21 | W 6-1 | 8-13 | 6 | 22,124 | Scott McGregor | Charlie Hough | Scott McGregor | Charlie Hough | | 83 | 102 | -19 |
| 1984-04-29 | vs TEX | 22 | W 3-2 | 9-13 | 5 | 34,467 | Storm Davis | Dave Stewart | Storm Davis | Dave Stewart | Tippy Martinez | 86 | 104 | -18 |
| 1984-04-30 | vs CLE | 23 | W 6-3 | 10-13 | 5 | 14,998 | Mike Flanagan | Neal Heaton | Sammy Stewart | Ernie Camacho | Tippy Martinez | 92 | 107 | -15 |
| 1984-05-01 | vs CLE | 24 | W 3-0 | 11-13 | 4 | 15,668 | Mike Boddicker | Bert Blyleven | Mike Boddicker | Bert Blyleven | | 95 | 107 | -12 |
| 1984-05-02 | vs CLE | 25 | L 7-9 | 11-14 | 4 | 12,968 | Scott McGregor | Rick Sutcliffe | George Frazier | Jim Palmer | | 102 | 116 | -14 |
| 1984-05-04 | @ TEX | 26 | W 2-0 | 12-14 | 5 | 14,199 | Storm Davis | Mike Mason | Storm Davis | Dave J. Schmidt | | 104 | 116 | -12 |
| 1984-05-05 | @ TEX | 27 | W 7-5 | 13-14 | 4 | 18,248 | Mike Flanagan | Danny Darwin | Dennis Martinez | Ricky Wright | Tippy Martinez | 111 | 121 | -10 |
| 1984-05-06 | @ TEX | 28 | W 6-1 | 14-14 | 3 | 13,224 | Mike Boddicker | Frank Tanana | Mike Boddicker | Frank Tanana | | 117 | 122 | -5 |
| 1984-05-09 | vs TOR | 29 | W 7-4 | 16-14 | 3 | 0 | Scott McGregor | Jim Clancy | Scott McGregor | Jim Clancy | | 124 | 126 | -2 |
| 1984-05-09 | vs TOR | 30 | W 7-3 | 16-14 | 3 | 18,731 | Storm Davis | Doyle Alexander | Tippy Martinez | Jimmy Key | | 131 | 129 | 2 |
| 1984-05-10 | vs TOR | 31 | L 3-4 | 16-15 | 3 | 11,214 | Mike Flanagan | Dave Stieb | Roy Lee Jackson | Dennis Martinez | | 134 | 133 | 1 |
| 1984-05-11 | vs OAK | 32 | W 4-3 | 17-15 | 3 | 39,760 | Mike Boddicker | Mike Warren | Mike Boddicker | Mike Warren | Tippy Martinez | 138 | 136 | 2 |
| 1984-05-12 | vs OAK | 33 | L 2-12 | 17-16 | 3 | 27,193 | Tom Underwood | Bill Krueger | Bill Krueger | Dennis Martinez | | 140 | 148 | -8 |
| 1984-05-13 | vs OAK | 34 | W 5-1 | 18-16 | 3 | 25,480 | Storm Davis | Steve McCatty | Storm Davis | Steve McCatty | | 145 | 149 | -4 |
| 1984-05-14 | vs CAL | 35 | W 4-1 | 19-16 | 3 | 21,666 | Scott McGregor | Geoff Zahn | Scott McGregor | Geoff Zahn | | 149 | 150 | -1 |
| 1984-05-15 | vs CAL | 36 | L 2-5 | 19-17 | 3 | 16,165 | Mike Flanagan | Ron Romanick | Ron Romanick | Mike Flanagan | Luis Sanchez | 151 | 155 | -4 |
| 1984-05-16 | vs CAL | 37 | W 5-0 | 20-17 | 3 | 22,948 | Mike Boddicker | Mike Witt | Mike Boddicker | Mike Witt | | 156 | 155 | 1 |
| 1984-05-18 | vs SEA | 38 | W 4-1 | 21-17 | 3 | 38,143 | Storm Davis | Jim Beattie | Storm Davis | Jim Beattie | | 160 | 156 | 4 |
| 1984-05-19 | vs SEA | 39 | L 5-6 | 21-18 | 3 | 28,187 | Scott McGregor | Mark Langston | Ed Vande Berg | Tippy Martinez | | 165 | 162 | 3 |
| 1984-05-20 | vs SEA | 40 | W 5-1 | 22-18 | 3 | 34,194 | Mike Flanagan | Mike Moore | Mike Flanagan | Mike Moore | Tippy Martinez | 170 | 163 | 7 |
| 1984-05-22 | @ OAK | 41 | L 4-6 | 22-19 | 3 | 14,027 | Mike Boddicker | Ray Burris | Ray Burris | Mike Boddicker | Bill Caudill | 174 | 169 | 5 |
| 1984-05-23 | @ OAK | 42 | W 9-5 | 23-19 | 3 | 10,675 | Scott McGregor | Mike Warren | Bill Swaggerty | Mike Warren | Tippy Martinez | 183 | 174 | 9 |
| 1984-05-24 | @ OAK | 43 | L 2-3 | 23-20 | 3 | 9,309 | Storm Davis | Bill Krueger | Bill Krueger | Storm Davis | Bill Caudill | 185 | 177 | 8 |
| 1984-05-25 | @ CAL | 44 | L 2-10 | 23-21 | 3 | 31,650 | Mike Flanagan | Ron Romanick | Ron Romanick | Mike Flanagan | | 187 | 187 | 0 |
| 1984-05-26 | @ CAL | 45 | W 9-5 | 24-21 | 3 | 36,967 | Mike Boddicker | Craig Swan | Mike Boddicker | Craig Swan | | 196 | 192 | 4 |
| 1984-05-27 | @ CAL | 46 | W 8-0 | 25-21 | 3 | 33,528 | Scott McGregor | Mike Witt | Scott McGregor | Mike Witt | | 204 | 192 | 12 |
| 1984-05-28 | @ SEA | 47 | W 7-4 | 26-21 | 3 | 11,251 | Storm Davis | Jim Beattie | Storm Davis | Jim Beattie | | 211 | 196 | 15 |
| 1984-05-29 | @ SEA | 48 | W 3-2 | 27-21 | 3 | 6,849 | Mike Flanagan | Mark Langston | Tippy Martinez | Paul Mirabella | | 214 | 198 | 16 |
| 1984-05-30 | @ SEA | 49 | W 8-2 | 28-21 | 3 | 8,104 | Mike Boddicker | Ed Vande Berg | Mike Boddicker | Ed Vande Berg | | 222 | 200 | 22 |
| 1984-06-01 | @ DET | 50 | L 2-14 | 28-22 | 3 | 47,252 | Scott McGregor | Dan Petry | Dan Petry | Scott McGregor | Doug Bair | 224 | 214 | 10 |
| 1984-06-02 | @ DET | 51 | W 5-0 | 29-22 | 3 | 40,292 | Storm Davis | Jack Morris | Storm Davis | Jack Morris | | 229 | 214 | 15 |
| 1984-06-03 | @ DET | 52 | W 2-1 | 30-22 | 3 | 34,228 | Mike Flanagan | Milt Wilcox | Mike Flanagan | Milt Wilcox | | 231 | 215 | 16 |
| 1984-06-04 | vs MIL | 53 | W 6-2 | 31-22 | 3 | 19,896 | Mike Boddicker | Pete Ladd | Mike Boddicker | Pete Ladd | | 237 | 217 | 20 |
| 1984-06-05 | vs MIL | 54 | L 3-8 | 31-23 | 3 | 20,581 | Bill Swaggerty | Jaime Cocanower | Jaime Cocanower | Bill Swaggerty | | 240 | 225 | 15 |
| 1984-06-06 | vs MIL | 55 | W 3-0 | 32-23 | 3 | 20,909 | Scott McGregor | Don Sutton | Scott McGregor | Don Sutton | | 243 | 225 | 18 |
| 1984-06-08 | vs DET | 56 | L 2-3 | 32-24 | 3 | 50,361 | Storm Davis | Milt Wilcox | Milt Wilcox | Storm Davis | Guillermo Hernandez | 245 | 228 | 17 |
| 1984-06-09 | vs DET | 57 | W 4-0 | 33-24 | 3 | 44,404 | Mike Flanagan | Juan Berenguer | Mike Flanagan | Juan Berenguer | | 249 | 228 | 21 |
| 1984-06-10 | vs DET | 58 | L 4-10 | 33-26 | 3 | 0 | Mike Boddicker | Glenn Abbott | Doug Bair | Mike Boddicker | Guillermo Hernandez | 253 | 238 | 15 |
| 1984-06-10 | vs DET | 59 | L 0-8 | 33-26 | 3 | 51,764 | Dennis Martinez | Dan Petry | Dan Petry | Dennis Martinez | | 253 | 246 | 7 |
| 1984-06-11 | @ MIL | 60 | W 3-1 | 34-26 | 3 | 19,746 | Scott McGregor | Don Sutton | Scott McGregor | Don Sutton | | 256 | 247 | 9 |
| 1984-06-12 | @ MIL | 61 | W 5-4 | 35-26 | 3 | 15,390 | Storm Davis | Bob McClure | Tippy Martinez | Rollie Fingers | Sammy Stewart | 261 | 251 | 10 |
| 1984-06-13 | @ MIL | 62 | L 1-6 | 35-27 | 3 | 18,778 | Mike Flanagan | Moose Haas | Moose Haas | Mike Flanagan | | 262 | 257 | 5 |
| 1984-06-14 | @ MIL | 63 | L 2-3 | 35-28 | 3 | 32,062 | Dennis Martinez | Bob Gibson | Rick Waits | Storm Davis | Rollie Fingers | 264 | 260 | 4 |
| 1984-06-15 | @ NYA | 64 | W 2-1 | 36-28 | 3 | 31,610 | Mike Boddicker | Bob Shirley | Mike Boddicker | Bob Shirley | Tippy Martinez | 266 | 261 | 5 |
| 1984-06-16 | @ NYA | 65 | L 3-8 | 36-29 | 3 | 37,583 | Scott McGregor | Jay Howell | Jay Howell | Scott McGregor | | 269 | 269 | 0 |
| 1984-06-17 | @ NYA | 66 | W 6-2 | 37-29 | 3 | 31,539 | Mike Flanagan | Dennis Rasmussen | Mike Flanagan | Dennis Rasmussen | | 275 | 271 | 4 |
| 1984-06-19 | @ BOS | 67 | W 9-7 | 38-29 | 3 | 23,230 | Storm Davis | Bob Ojeda | Bill Swaggerty | Bob Stanley | Tippy Martinez | 284 | 278 | 6 |
| 1984-06-20 | @ BOS | 68 | W 4-1 | 39-29 | 3 | 23,736 | Mike Boddicker | Oil Can Boyd | Mike Boddicker | Oil Can Boyd | | 288 | 279 | 9 |
| 1984-06-21 | vs NYA | 69 | L 3-5 | 39-30 | 3 | 29,286 | Scott McGregor | Shane Rawley | Shane Rawley | Scott McGregor | Clay Christiansen | 291 | 284 | 7 |
| 1984-06-22 | vs NYA | 70 | W 5-4 | 40-30 | 3 | 37,849 | Mike Flanagan | Dennis Rasmussen | Mike Flanagan | Dennis Rasmussen | Tippy Martinez | 296 | 288 | 8 |
| 1984-06-23 | vs NYA | 71 | L 4-5 | 40-31 | 3 | 42,785 | Dennis Martinez | Phil Niekro | Jose Rijo | Tippy Martinez | Clay Christiansen | 300 | 293 | 7 |
| 1984-06-25 | vs BOS | 72 | L 4-7 | 40-32 | 3 | 24,087 | Storm Davis | Oil Can Boyd | Oil Can Boyd | Storm Davis | Mark Clear | 304 | 300 | 4 |
| 1984-06-26 | vs BOS | 73 | L 2-5 | 40-33 | 3 | 27,115 | Mike Boddicker | Al Nipper | Al Nipper | Mike Boddicker | Bob Stanley | 306 | 305 | 1 |
| 1984-06-27 | vs BOS | 74 | W 3-1 | 41-33 | 3 | 26,372 | Scott McGregor | Roger Clemens | Scott McGregor | Roger Clemens | Sammy Stewart | 309 | 306 | 3 |
| 1984-06-28 | @ CHA | 75 | W 2-0 | 42-33 | 3 | 31,077 | Mike Flanagan | Tom Seaver | Mike Flanagan | Tom Seaver | Tippy Martinez | 311 | 306 | 5 |
| 1984-06-29 | @ CHA | 76 | L 1-2 | 42-34 | 3 | 34,802 | Dennis Martinez | Richard Dotson | Richard Dotson | Dennis Martinez | | 312 | 308 | 4 |
| 1984-06-30 | @ CHA | 77 | L 4-5 | 42-35 | 3 | 35,974 | Storm Davis | Britt Burns | Al Jones | Sammy Stewart | | 316 | 313 | 3 |
| 1984-07-01 | @ CHA | 78 | W 8-3 | 43-35 | 3 | 33,440 | Mike Boddicker | LaMarr Hoyt | Mike Boddicker | LaMarr Hoyt | | 324 | 316 | 8 |
| 1984-07-02 | @ MIN | 79 | L 4-6 | 43-36 | 3 | 12,081 | Scott McGregor | John Butcher | John Butcher | Scott McGregor | | 328 | 322 | 6 |
| 1984-07-03 | @ MIN | 80 | L 1-3 | 43-37 | 3 | 22,803 | Mike Flanagan | Mike Smithson | Mike Smithson | Mike Flanagan | | 329 | 325 | 4 |
| 1984-07-04 | @ MIN | 81 | W 6-4 | 44-37 | 3 | 16,547 | Dennis Martinez | Albert Williams | Dennis Martinez | Albert Williams | Tippy Martinez | 335 | 329 | 6 |
| 1984-07-06 | vs KCA | 82 | L 2-6 | 44-38 | 3 | 24,109 | Mike Boddicker | Charlie Leibrandt | Charlie Leibrandt | Mike Boddicker | Dan Quisenberry | 337 | 335 | 2 |
| 1984-07-07 | vs KCA | 83 | W 6-2 | 46-38 | 3 | 0 | Scott McGregor | Larry Gura | Scott McGregor | Larry Gura | | 343 | 337 | 6 |
| 1984-07-07 | vs KCA | 84 | W 8-0 | 46-38 | 3 | 46,842 | Mike Flanagan | Mike Jones | Mike Flanagan | Mike Jones | | 351 | 337 | 14 |
| 1984-07-08 | vs KCA | 85 | L 1-6 | 46-39 | 3 | 25,604 | Dennis Martinez | Buddy Black | Buddy Black | Dennis Martinez | | 352 | 343 | 9 |
| 1984-07-12 | vs CHA | 86 | W 2-1 | 48-39 | 3 | 0 | Storm Davis | LaMarr Hoyt | Storm Davis | LaMarr Hoyt | Sammy Stewart | 354 | 344 | 10 |
| 1984-07-12 | vs CHA | 87 | W 3-0 | 48-39 | 3 | 36,302 | Scott McGregor | Gene Nelson | Scott McGregor | Gene Nelson | | 357 | 344 | 13 |
| 1984-07-13 | vs CHA | 88 | W 7-5 | 49-39 | 3 | 30,797 | Mike Boddicker | Floyd Bannister | Tippy Martinez | Ron Reed | | 364 | 349 | 15 |
| 1984-07-14 | vs CHA | 89 | L 2-3 | 49-40 | 3 | 26,721 | Mike Flanagan | Tom Seaver | Tom Seaver | Mike Flanagan | | 366 | 352 | 14 |
| 1984-07-15 | vs CHA | 90 | W 6-4 | 50-40 | 3 | 43,935 | Dennis Martinez | Richard Dotson | Dennis Martinez | Richard Dotson | Tippy Martinez | 372 | 356 | 16 |
| 1984-07-16 | vs MIN | 91 | W 3-1 | 51-40 | 3 | 24,178 | Storm Davis | Mike Smithson | Storm Davis | Mike Smithson | | 375 | 357 | 18 |
| 1984-07-17 | vs MIN | 92 | W 3-1 | 52-40 | 3 | 22,643 | Scott McGregor | Frank Viola | Scott McGregor | Frank Viola | | 378 | 358 | 20 |
| 1984-07-18 | vs MIN | 93 | L 1-3 | 52-41 | 3 | 19,067 | Mike Boddicker | John Butcher | John Butcher | Mike Boddicker | | 379 | 361 | 18 |
| 1984-07-19 | @ KCA | 94 | L 3-6 | 52-42 | 3 | 29,342 | Mike Flanagan | Mark Gubicza | Mark Gubicza | Mike Flanagan | | 382 | 367 | 15 |
| 1984-07-20 | @ KCA | 95 | L 3-4 | 52-43 | 3 | 28,707 | Dennis Martinez | Charlie Leibrandt | Bret Saberhagen | Tippy Martinez | Dan Quisenberry | 385 | 371 | 14 |
| 1984-07-21 | @ KCA | 96 | W 4-3 | 53-43 | 3 | 26,355 | Storm Davis | Mike Jones | Storm Davis | Mark Huismann | Sammy Stewart | 389 | 374 | 15 |
| 1984-07-22 | @ KCA | 97 | L 4-8 | 53-44 | 3 | 38,190 | Scott McGregor | Larry Gura | Larry Gura | Scott McGregor | | 393 | 382 | 11 |
| 1984-07-23 | @ TEX | 98 | W 9-5 | 54-44 | 3 | 14,983 | Mike Boddicker | Mike Mason | Mike Boddicker | Mike Mason | Tippy Martinez | 402 | 387 | 15 |
| 1984-07-24 | @ TEX | 99 | L 2-3 | 54-45 | 3 | 15,451 | Mike Flanagan | Danny Darwin | Danny Darwin | Mike Flanagan | | 404 | 390 | 14 |
| 1984-07-25 | @ TEX | 100 | W 3-1 | 55-45 | 3 | 14,333 | Dennis Martinez | Frank Tanana | Dennis Martinez | Frank Tanana | Sammy Stewart | 407 | 391 | 16 |
| 1984-07-27 | vs CLE | 101 | W 4-3 | 56-45 | 3 | 37,368 | Storm Davis | Neal Heaton | Storm Davis | Neal Heaton | | 411 | 394 | 17 |
| 1984-07-28 | vs CLE | 102 | L 3-6 | 56-46 | 3 | 27,273 | Scott McGregor | Bert Blyleven | Bert Blyleven | Scott McGregor | Tom Waddell | 414 | 400 | 14 |
| 1984-07-29 | vs CLE | 103 | W 3-1 | 57-46 | 3 | 20,707 | Mike Boddicker | Steve Comer | Mike Boddicker | Steve Comer | Sammy Stewart | 417 | 401 | 16 |
| 1984-07-30 | vs TEX | 104 | L 1-5 | 57-47 | 3 | 22,529 | Mike Flanagan | Frank Tanana | Frank Tanana | Mike Flanagan | | 418 | 406 | 12 |
| 1984-07-31 | vs TEX | 105 | L 6-7 | 57-48 | 3 | 30,107 | Dennis Martinez | Dave Stewart | Odell Jones | Tippy Martinez | Dave J. Schmidt | 424 | 413 | 11 |
| 1984-08-01 | vs TEX | 106 | W 7-2 | 58-48 | 3 | 16,721 | Storm Davis | Charlie Hough | Storm Davis | Charlie Hough | | 431 | 415 | 16 |
| 1984-08-03 | vs TOR | 107 | L 2-5 | 58-49 | 3 | 37,219 | Scott McGregor | Dave Stieb | Roy Lee Jackson | Scott McGregor | | 433 | 420 | 13 |
| 1984-08-04 | vs TOR | 108 | L 2-6 | 58-50 | 3 | 37,685 | Mike Flanagan | Jim Clancy | Jim Clancy | Mike Flanagan | | 435 | 426 | 9 |
| 1984-08-05 | vs TOR | 109 | L 3-4 | 58-51 | 3 | 34,016 | Dennis Martinez | Doyle Alexander | Jimmy Key | Tippy Martinez | Dennis Lamp | 438 | 430 | 8 |
| 1984-08-06 | @ CLE | 110 | W 4-2 | 59-51 | 3 | 5,504 | Storm Davis | Steve Farr | Storm Davis | Steve Farr | | 442 | 432 | 10 |
| 1984-08-07 | @ CLE | 111 | L 4-5 | 59-52 | 3 | 5,040 | Scott McGregor | Bert Blyleven | Bert Blyleven | Scott McGregor | Ernie Camacho | 446 | 437 | 9 |
| 1984-08-08 | @ CLE | 112 | W 7-4 | 60-52 | 3 | 5,401 | Mike Boddicker | Steve Comer | Mike Boddicker | Steve Comer | Tippy Martinez | 453 | 441 | 12 |
| 1984-08-09 | @ CLE | 113 | L 5-7 | 60-53 | 3 | 5,341 | Mike Flanagan | Roy Smith | Jamie Easterly | Mark Brown | Ernie Camacho | 458 | 448 | 10 |
| 1984-08-10 | @ TOR | 114 | L 0-2 | 60-54 | 3 | 34,107 | Dennis Martinez | Doyle Alexander | Doyle Alexander | Dennis Martinez | | 458 | 450 | 8 |
| 1984-08-11 | @ TOR | 115 | L 2-3 | 60-55 | 4 | 41,426 | Storm Davis | Luis Leal | Jim Gott | Storm Davis | | 460 | 453 | 7 |
| 1984-08-12 | @ TOR | 116 | W 5-4 | 61-55 | 3 | 36,363 | Scott McGregor | Dave Stieb | Scott McGregor | Roy Lee Jackson | Tippy Martinez | 465 | 457 | 8 |
| 1984-08-13 | @ TOR | 117 | W 2-1 | 62-55 | 3 | 33,238 | Mike Boddicker | Jim Clancy | Mike Boddicker | Jim Clancy | | 467 | 458 | 9 |
| 1984-08-14 | vs OAK | 118 | L 3-4 | 62-56 | 3 | 17,713 | Mike Flanagan | Ray Burris | Tom Burgmeier | Sammy Stewart | | 470 | 462 | 8 |
| 1984-08-15 | vs OAK | 119 | L 1-6 | 62-57 | 3 | 16,249 | Dennis Martinez | Curt Young | Curt Young | Dennis Martinez | | 471 | 468 | 3 |
| 1984-08-16 | vs OAK | 120 | L 1-8 | 62-58 | 4 | 23,510 | Storm Davis | Lary Sorensen | Lary Sorensen | Storm Davis | | 472 | 476 | -4 |
| 1984-08-17 | vs CAL | 121 | W 6-5 | 63-58 | 3 | 29,432 | Scott McGregor | Jim Slaton | Scott McGregor | Jim Slaton | Sammy Stewart | 478 | 481 | -3 |
| 1984-08-18 | vs CAL | 122 | W 1-0 | 64-58 | 3 | 29,219 | Mike Boddicker | Mike Witt | Mike Boddicker | Mike Witt | | 479 | 481 | -2 |
| 1984-08-19 | vs CAL | 123 | W 10-4 | 65-58 | 3 | 25,823 | Mike Flanagan | Bruce Kison | Mike Flanagan | Bruce Kison | | 489 | 485 | 4 |
| 1984-08-20 | vs SEA | 124 | W 5-4 | 66-58 | 3 | 19,620 | Dennis Martinez | Jim Beattie | Dennis Martinez | Jim Beattie | Sammy Stewart | 494 | 489 | 5 |
| 1984-08-21 | vs SEA | 125 | L 3-4 | 66-59 | 3 | 16,587 | Storm Davis | Salome Barojas | Salome Barojas | Storm Davis | Ed Nunez | 497 | 493 | 4 |
| 1984-08-22 | vs SEA | 126 | W 4-0 | 67-59 | 3 | 15,808 | Scott McGregor | Mike Moore | Scott McGregor | Mike Moore | | 501 | 493 | 8 |
| 1984-08-24 | @ OAK | 127 | W 4-2 | 68-59 | 3 | 13,688 | Mike Boddicker | Steve McCatty | Mike Boddicker | Steve McCatty | | 505 | 495 | 10 |
| 1984-08-25 | @ OAK | 128 | W 4-2 | 69-59 | 3 | 18,232 | Mike Flanagan | Ray Burris | Mike Flanagan | Ray Burris | Sammy Stewart | 509 | 497 | 12 |
| 1984-08-26 | @ OAK | 129 | W 13-6 | 70-59 | 3 | 21,150 | Dennis Martinez | Curt Young | Tom Underwood | Curt Young | Sammy Stewart | 522 | 503 | 19 |
| 1984-08-27 | @ CAL | 130 | W 7-6 | 71-59 | 3 | 23,440 | Storm Davis | Ron Romanick | Sammy Stewart | Luis Sanchez | | 529 | 509 | 20 |
| 1984-08-28 | @ CAL | 131 | L 2-4 | 71-60 | 3 | 25,729 | Scott McGregor | Jim Slaton | Jim Slaton | Scott McGregor | Don Aase | 531 | 513 | 18 |
| 1984-08-29 | @ CAL | 132 | L 5-7 | 71-61 | 3 | 25,191 | Mike Boddicker | Mike Witt | Doug Corbett | Mike Boddicker | | 536 | 520 | 16 |
| 1984-08-31 | @ SEA | 133 | W 11-7 | 72-61 | 3 | 8,206 | Mike Flanagan | Salome Barojas | Sammy Stewart | Paul Mirabella | Tippy Martinez | 547 | 527 | 20 |
| 1984-09-01 | @ SEA | 134 | L 9-10 | 72-62 | 3 | 9,782 | Dennis Martinez | Matt Young | Ed Vande Berg | Tippy Martinez | Ed Nunez | 556 | 537 | 19 |
| 1984-09-02 | @ SEA | 135 | W 4-3 | 73-62 | 3 | 6,894 | Bill Swaggerty | Mike Moore | Bill Swaggerty | Mike Moore | Tom Underwood | 560 | 540 | 20 |
| 1984-09-03 | @ DET | 136 | W 7-4 | 74-62 | 3 | 36,797 | Storm Davis | Jack Morris | Sammy Stewart | Jack Morris | | 567 | 544 | 23 |
| 1984-09-04 | @ DET | 137 | W 4-1 | 75-62 | 3 | 27,767 | Mike Boddicker | Dave Rozema | Mike Boddicker | Dave Rozema | Sammy Stewart | 571 | 545 | 26 |
| 1984-09-05 | @ DET | 138 | L 0-1 | 75-63 | 3 | 34,065 | Mike Flanagan | Juan Berenguer | Juan Berenguer | Mike Flanagan | Guillermo Hernandez | 571 | 546 | 25 |
| 1984-09-07 | vs MIL | 139 | L 8-10 | 75-64 | 3 | 32,488 | Dennis Martinez | Bob McClure | Tom Tellmann | Sammy Stewart | Ray Searage | 579 | 556 | 23 |
| 1984-09-08 | vs MIL | 140 | W 5-3 | 76-64 | 3 | 21,627 | Storm Davis | Tom Candiotti | Storm Davis | Jack Lazorko | Sammy Stewart | 584 | 559 | 25 |
| 1984-09-09 | vs MIL | 141 | W 4-0 | 77-64 | 3 | 22,822 | Mike Boddicker | Bob Gibson | Mike Boddicker | Bob Gibson | | 588 | 559 | 29 |
| 1984-09-10 | vs DET | 142 | W 3-1 | 78-64 | 3 | 27,440 | Mike Flanagan | Juan Berenguer | Mike Flanagan | Juan Berenguer | | 591 | 560 | 31 |
| 1984-09-11 | vs DET | 143 | L 2-9 | 78-65 | 3 | 25,193 | Bill Swaggerty | Dan Petry | Dan Petry | Bill Swaggerty | | 593 | 569 | 24 |
| 1984-09-12 | vs DET | 144 | W 3-1 | 79-65 | 3 | 24,561 | Dennis Martinez | Roger Mason | Dennis Martinez | Roger Mason | | 596 | 570 | 26 |
| 1984-09-14 | @ MIL | 145 | L 2-4 | 79-66 | 3 | 23,410 | Mike Boddicker | Tom Candiotti | Tom Candiotti | Mike Boddicker | Ray Searage | 598 | 574 | 24 |
| 1984-09-15 | @ MIL | 146 | L 0-7 | 79-67 | 3 | 16,067 | Mike Flanagan | Bob Gibson | Bob Gibson | Mike Flanagan | | 598 | 581 | 17 |
| 1984-09-16 | @ MIL | 147 | W 11-8 | 80-67 | 3 | 18,683 | Storm Davis | Don Sutton | Storm Davis | Don Sutton | | 609 | 589 | 20 |
| 1984-09-17 | @ NYA | 148 | L 7-12 | 80-68 | 3 | 16,639 | Bill Swaggerty | Phil Niekro | Jay Howell | John Pacella | | 616 | 601 | 15 |
| 1984-09-18 | @ NYA | 149 | L 2-10 | 80-69 | 3 | 14,380 | Dennis Martinez | Ray Fontenot | Ray Fontenot | Dennis Martinez | | 618 | 611 | 7 |
| 1984-09-19 | @ NYA | 150 | L 5-6 | 80-70 | 4 | 17,862 | Mike Boddicker | Joe Cowley | Joe Cowley | Mike Boddicker | Dave Righetti | 623 | 617 | 6 |
| 1984-09-20 | vs BOS | 151 | W 15-1 | 81-70 | 3 | 20,321 | Mike Flanagan | Al Nipper | Mike Flanagan | Al Nipper | | 638 | 618 | 20 |
| 1984-09-21 | vs BOS | 152 | L 0-8 | 81-71 | 4 | 21,577 | Storm Davis | Oil Can Boyd | Oil Can Boyd | Storm Davis | | 638 | 626 | 12 |
| 1984-09-22 | vs BOS | 153 | L 2-4 | 81-72 | 5 | 23,892 | Ken Dixon | Bob Ojeda | Bob Ojeda | Ken Dixon | Bob Stanley | 640 | 630 | 10 |
| 1984-09-23 | vs BOS | 154 | L 2-6 | 81-73 | 5 | 28,847 | Dennis Martinez | Rich Gale | John Henry Johnson | Dennis Martinez | | 642 | 636 | 6 |
| 1984-09-24 | vs NYA | 155 | W 8-1 | 83-73 | 3 | 0 | Mike Boddicker | Ron Guidry | Mike Boddicker | Ron Guidry | | 650 | 637 | 13 |
| 1984-09-24 | vs NYA | 156 | W 7-6 | 83-73 | 3 | 19,864 | Bill Swaggerty | Dennis Rasmussen | Nate Snell | Dave Righetti | | 657 | 643 | 14 |
| 1984-09-25 | vs NYA | 157 | L 5-6 | 83-74 | 4 | 20,602 | Mike Flanagan | Joe Cowley | Bob Shirley | Mark Brown | Dave Righetti | 662 | 649 | 13 |
| 1984-09-26 | vs NYA | 158 | L 1-3 | 83-75 | 5 | 20,831 | Storm Davis | John Montefusco | John Montefusco | Storm Davis | Dave Righetti | 663 | 652 | 11 |
| 1984-09-27 | @ BOS | 159 | L 3-4 | 83-76 | 5 | 14,663 | Ken Dixon | Bob Ojeda | Mark Clear | Sammy Stewart | | 666 | 656 | 10 |
| 1984-09-28 | @ BOS | 160 | L 4-5 | 83-77 | 5 | 19,300 | Bill Swaggerty | Rich Gale | Bob Stanley | Nate Snell | | 670 | 661 | 9 |
| 1984-09-29 | @ BOS | 161 | W 6-3 | 84-77 | 5 | 23,655 | Mike Boddicker | Bruce Hurst | Mike Boddicker | Bruce Hurst | | 676 | 664 | 12 |
| 1984-09-30 | @ BOS | 162 | W 5-3 | 85-77 | 5 | 23,628 | John Pacella | Al Nipper | Mark Brown | Oil Can Boyd | Sammy Stewart | 681 | 667 | 14 |