| 1984-04-02 | vs BOS | 1 | W 2-1 | 1-0 | 2 | 31,760 | Ken Forsch | Bruce Hurst | Ken Forsch | Bruce Hurst | | 2 | 1 | 1 |
| 1984-04-04 | vs BOS | 2 | L 1-2 | 1-1 | 5 | 24,300 | Mike Witt | Bob Ojeda | Mark Clear | Luis Sanchez | | 3 | 3 | 0 |
| 1984-04-05 | vs BOS | 3 | L 4-7 | 1-2 | 5 | 22,235 | Ron Romanick | Dennis Eckersley | Bob Stanley | Curt Kaufman | | 7 | 10 | -3 |
| 1984-04-06 | vs TOR | 4 | L 5-11 | 1-3 | 7 | 24,431 | Steve Brown | Doyle Alexander | Jimmy Key | Steve Brown | | 12 | 21 | -9 |
| 1984-04-07 | vs TOR | 5 | L 1-3 | 1-4 | 7 | 41,859 | Ken Forsch | Dave Stieb | Dave Stieb | Ken Forsch | Dennis Lamp | 13 | 24 | -11 |
| 1984-04-08 | vs TOR | 6 | W 4-3 | 2-4 | 6 | 24,095 | Tommy John | Jim Acker | Luis Sanchez | Roy Lee Jackson | | 17 | 27 | -10 |
| 1984-04-10 | vs MIL | 7 | L 1-10 | 2-5 | 7 | 23,754 | Mike Witt | Mike Caldwell | Mike Caldwell | Mike Witt | | 18 | 37 | -19 |
| 1984-04-11 | vs MIL | 8 | W 9-5 | 3-5 | 6 | 24,266 | Ron Romanick | Moose Haas | Ron Romanick | Moose Haas | | 27 | 42 | -15 |
| 1984-04-12 | @ OAK | 9 | W 3-2 | 4-5 | 6 | 18,085 | Geoff Zahn | Mike Warren | Geoff Zahn | Mike Warren | Luis Sanchez | 30 | 44 | -14 |
| 1984-04-13 | @ OAK | 10 | L 1-2 | 4-6 | 6 | 14,732 | Tommy John | Steve McCatty | Bill Caudill | Tommy John | | 31 | 46 | -15 |
| 1984-04-14 | @ OAK | 11 | L 3-4 | 4-7 | 6 | 17,570 | Steve Brown | Tim Conroy | Bill Caudill | Curt Kaufman | | 34 | 50 | -16 |
| 1984-04-15 | @ OAK | 12 | W 12-8 | 5-7 | 6 | 30,193 | Mike Witt | Lary Sorensen | Mike Witt | Lary Sorensen | Doug Corbett | 46 | 58 | -12 |
| 1984-04-16 | @ MIN | 13 | L 2-9 | 5-8 | 6 | 6,227 | Ron Romanick | Mike Smithson | Mike Smithson | Ron Romanick | | 48 | 67 | -19 |
| 1984-04-17 | @ MIN | 14 | W 6-3 | 6-8 | 6 | 9,370 | Tommy John | John Butcher | Tommy John | John Butcher | Luis Sanchez | 54 | 70 | -16 |
| 1984-04-18 | @ MIN | 15 | W 9-2 | 7-8 | 4 | 7,967 | Geoff Zahn | Albert Williams | Geoff Zahn | Albert Williams | | 63 | 72 | -9 |
| 1984-04-20 | @ TOR | 16 | W 10-6 | 8-8 | 5 | 37,241 | Mike Witt | Luis Leal | Luis Sanchez | Jim Acker | | 73 | 78 | -5 |
| 1984-04-21 | @ TOR | 17 | W 8-4 | 9-8 | 3 | 44,164 | Ron Romanick | Jim Gott | Ron Romanick | Jim Gott | | 81 | 82 | -1 |
| 1984-04-22 | @ TOR | 18 | W 9-6 | 10-8 | 3 | 16,462 | Tommy John | Doyle Alexander | Jim Slaton | Jimmy Key | Curt Kaufman | 90 | 88 | 2 |
| 1984-04-23 | @ BOS | 19 | L 0-2 | 10-9 | 3 | 12,912 | Geoff Zahn | Bob Ojeda | Bob Ojeda | Geoff Zahn | | 90 | 90 | 0 |
| 1984-04-24 | @ BOS | 20 | W 8-7 | 11-9 | 3 | 12,330 | Steve Brown | Oil Can Boyd | Luis Sanchez | Bob Stanley | | 98 | 97 | 1 |
| 1984-04-25 | @ MIL | 21 | W 5-1 | 12-9 | 1 | 10,426 | Mike Witt | Jaime Cocanower | Mike Witt | Jaime Cocanower | | 103 | 98 | 5 |
| 1984-04-26 | @ MIL | 22 | L 1-2 | 12-10 | 3 | 14,680 | Tommy John | Don Sutton | Don Sutton | Tommy John | Rollie Fingers | 104 | 100 | 4 |
| 1984-04-27 | vs SEA | 23 | W 9-3 | 13-10 | 2 | 26,526 | Ron Romanick | Bob Stoddard | Ron Romanick | Bob Stoddard | | 113 | 103 | 10 |
| 1984-04-28 | vs SEA | 24 | W 10-1 | 14-10 | 2 | 31,537 | Geoff Zahn | Mark Langston | Geoff Zahn | Mark Langston | | 123 | 104 | 19 |
| 1984-04-29 | vs SEA | 25 | L 6-9 | 14-11 | 2 | 45,069 | Curt Kaufman | Mike Moore | Roy Thomas | Frank LaCorte | | 129 | 113 | 16 |
| 1984-04-30 | vs SEA | 26 | W 8-1 | 15-11 | 2 | 23,347 | Mike Witt | Paul Mirabella | Mike Witt | Paul Mirabella | | 137 | 114 | 23 |
| 1984-05-01 | vs OAK | 27 | W 4-1 | 16-11 | 1 | 27,009 | Tommy John | Mike Warren | Tommy John | Mike Warren | Luis Sanchez | 141 | 115 | 26 |
| 1984-05-02 | vs OAK | 28 | L 6-7 | 16-12 | 2 | 27,939 | Ron Romanick | Steve McCatty | Keith Atherton | Ron Romanick | Bill Caudill | 147 | 122 | 25 |
| 1984-05-04 | @ SEA | 29 | W 4-1 | 17-12 | 1 | 13,426 | Geoff Zahn | Mike Moore | Geoff Zahn | Mike Moore | | 151 | 123 | 28 |
| 1984-05-05 | @ SEA | 30 | W 3-1 | 18-12 | 1 | 28,109 | Mike Witt | Jim Beattie | Mike Witt | Jim Beattie | | 154 | 124 | 30 |
| 1984-05-06 | @ SEA | 31 | L 1-3 | 18-13 | 1 | 11,378 | Tommy John | Ed Vande Berg | Ed Vande Berg | Tommy John | Dave Beard | 155 | 127 | 28 |
| 1984-05-07 | vs MIN | 32 | L 1-11 | 18-14 | 1 | 23,575 | Ron Romanick | Mike Smithson | Mike Smithson | Ron Romanick | | 156 | 138 | 18 |
| 1984-05-08 | vs MIN | 33 | L 0-5 | 18-15 | 2 | 23,678 | Jim Slaton | Frank Viola | Frank Viola | Jim Slaton | | 156 | 143 | 13 |
| 1984-05-09 | vs MIN | 34 | L 2-5 | 18-16 | 3 | 24,682 | Geoff Zahn | John Butcher | Pete Filson | Geoff Zahn | | 158 | 148 | 10 |
| 1984-05-11 | @ DET | 35 | L 2-8 | 18-17 | 4 | 44,187 | Mike Witt | Milt Wilcox | Milt Wilcox | Mike Witt | Guillermo Hernandez | 160 | 156 | 4 |
| 1984-05-12 | @ DET | 36 | W 4-2 | 19-17 | 4 | 38,516 | Tommy John | Juan Berenguer | Tommy John | Juan Berenguer | | 164 | 158 | 6 |
| 1984-05-14 | @ BAL | 37 | L 1-4 | 19-18 | 2 | 21,666 | Geoff Zahn | Scott McGregor | Scott McGregor | Geoff Zahn | | 165 | 162 | 3 |
| 1984-05-15 | @ BAL | 38 | W 5-2 | 20-18 | 1 | 16,165 | Ron Romanick | Mike Flanagan | Ron Romanick | Mike Flanagan | Luis Sanchez | 170 | 164 | 6 |
| 1984-05-16 | @ BAL | 39 | L 0-5 | 20-19 | 1 | 22,948 | Mike Witt | Mike Boddicker | Mike Boddicker | Mike Witt | | 170 | 169 | 1 |
| 1984-05-18 | @ NYA | 40 | W 4-3 | 21-19 | 1 | 23,609 | Tommy John | Shane Rawley | Luis Sanchez | Jay Howell | | 174 | 172 | 2 |
| 1984-05-19 | @ NYA | 41 | W 4-0 | 22-19 | 1 | 25,143 | Geoff Zahn | Phil Niekro | Geoff Zahn | Phil Niekro | | 178 | 172 | 6 |
| 1984-05-20 | @ NYA | 42 | W 3-0 | 23-19 | 1 | 36,592 | Ron Romanick | Ron Guidry | Ron Romanick | Ron Guidry | | 181 | 172 | 9 |
| 1984-05-22 | vs DET | 43 | L 1-3 | 23-20 | 1 | 41,253 | Mike Witt | Juan Berenguer | Juan Berenguer | Mike Witt | Aurelio Lopez | 182 | 175 | 7 |
| 1984-05-23 | vs DET | 44 | L 2-4 | 23-21 | 1 | 41,205 | Tommy John | Dan Petry | Dan Petry | Frank LaCorte | Guillermo Hernandez | 184 | 179 | 5 |
| 1984-05-24 | vs DET | 45 | L 1-5 | 23-22 | 1 | 43,580 | Jim Slaton | Jack Morris | Jack Morris | Jim Slaton | | 185 | 184 | 1 |
| 1984-05-25 | vs BAL | 46 | W 10-2 | 24-22 | 1 | 31,650 | Ron Romanick | Mike Flanagan | Ron Romanick | Mike Flanagan | | 195 | 186 | 9 |
| 1984-05-26 | vs BAL | 47 | L 5-9 | 24-23 | 1 | 36,967 | Craig Swan | Mike Boddicker | Mike Boddicker | Craig Swan | | 200 | 195 | 5 |
| 1984-05-27 | vs BAL | 48 | L 0-8 | 24-24 | 1 | 33,528 | Mike Witt | Scott McGregor | Scott McGregor | Mike Witt | | 200 | 203 | -3 |
| 1984-05-28 | vs NYA | 49 | W 6-2 | 25-24 | 1 | 34,277 | Doug Corbett | Dennis Rasmussen | Doug Corbett | Dennis Rasmussen | | 206 | 205 | 1 |
| 1984-05-29 | vs NYA | 50 | W 6-5 | 26-24 | 1 | 28,852 | Frank LaCorte | Phil Niekro | Frank LaCorte | Phil Niekro | Luis Sanchez | 212 | 210 | 2 |
| 1984-05-30 | vs NYA | 51 | L 1-10 | 26-25 | 1 | 31,963 | Ron Romanick | Ron Guidry | Ron Guidry | Ron Romanick | | 213 | 220 | -7 |
| 1984-06-01 | @ CLE | 52 | W 5-2 | 27-25 | 1 | 15,571 | Mike Witt | Rick Sutcliffe | Mike Witt | Rick Sutcliffe | Doug Corbett | 218 | 222 | -4 |
| 1984-06-02 | @ CLE | 53 | W 6-4 | 28-25 | 1 | 7,926 | Tommy John | Steve Comer | Luis Sanchez | Ernie Camacho | | 224 | 226 | -2 |
| 1984-06-03 | @ CLE | 54 | W 7-4 | 29-25 | 1 | 13,962 | Jim Slaton | Dan Spillner | Curt Kaufman | Dan Spillner | | 231 | 230 | 1 |
| 1984-06-04 | @ CHA | 55 | L 4-6 | 29-26 | 1 | 25,779 | Ron Romanick | LaMarr Hoyt | LaMarr Hoyt | Ron Romanick | Al Jones | 235 | 236 | -1 |
| 1984-06-05 | @ CHA | 56 | W 6-1 | 30-26 | 1 | 26,918 | Geoff Zahn | Britt Burns | Geoff Zahn | Britt Burns | | 241 | 237 | 4 |
| 1984-06-06 | @ CHA | 57 | L 0-4 | 30-27 | 1 | 20,995 | Mike Witt | Tom Seaver | Tom Seaver | Mike Witt | | 241 | 241 | 0 |
| 1984-06-07 | @ CHA | 58 | L 10-11 | 30-28 | 1 | 20,721 | Tommy John | Richard Dotson | Bert Roberge | Tommy John | Al Jones | 251 | 252 | -1 |
| 1984-06-09 | @ KCA | 59 | W 4-1 | 31-28 | 1 | 25,835 | Ron Romanick | Buddy Black | Ron Romanick | Buddy Black | Luis Sanchez | 255 | 253 | 2 |
| 1984-06-10 | @ KCA | 60 | W 2-0 | 32-28 | 1 | 31,490 | Geoff Zahn | Mark Gubicza | Geoff Zahn | Mark Gubicza | | 257 | 253 | 4 |
| 1984-06-12 | vs CHA | 61 | W 3-2 | 33-28 | 1 | 24,125 | Mike Witt | Tom Seaver | Doug Corbett | Al Jones | | 260 | 255 | 5 |
| 1984-06-13 | vs CHA | 62 | L 1-2 | 33-29 | 1 | 28,046 | Tommy John | Richard Dotson | Richard Dotson | Tommy John | | 261 | 257 | 4 |
| 1984-06-14 | vs CHA | 63 | W 9-3 | 34-29 | 1 | 26,831 | Ron Romanick | Britt Burns | Ron Romanick | Britt Burns | Doug Corbett | 270 | 260 | 10 |
| 1984-06-15 | vs CLE | 64 | W 5-2 | 35-29 | 1 | 26,266 | Geoff Zahn | Neal Heaton | Geoff Zahn | Neal Heaton | Luis Sanchez | 275 | 262 | 13 |
| 1984-06-16 | vs CLE | 65 | W 7-2 | 36-29 | 1 | 35,107 | Jim Slaton | Steve Farr | Jim Slaton | Steve Farr | Bruce Kison | 282 | 264 | 18 |
| 1984-06-17 | vs CLE | 66 | L 3-4 | 36-30 | 1 | 35,181 | Mike Witt | Dan Spillner | Ernie Camacho | Mike Witt | | 285 | 268 | 17 |
| 1984-06-18 | vs TEX | 67 | L 2-6 | 36-31 | 1 | 21,817 | Tommy John | Frank Tanana | Frank Tanana | Tommy John | | 287 | 274 | 13 |
| 1984-06-19 | vs TEX | 68 | L 2-4 | 36-32 | 1 | 24,625 | Ron Romanick | Dave Stewart | Dave Stewart | Ron Romanick | Odell Jones | 289 | 278 | 11 |
| 1984-06-20 | vs TEX | 69 | L 2-3 | 36-33 | 1 | 27,215 | Geoff Zahn | Charlie Hough | Charlie Hough | Geoff Zahn | | 291 | 281 | 10 |
| 1984-06-22 | vs KCA | 70 | W 8-1 | 37-33 | 1 | 31,324 | Mike Witt | Charlie Leibrandt | Mike Witt | Charlie Leibrandt | | 299 | 282 | 17 |
| 1984-06-23 | vs KCA | 71 | L 5-6 | 37-34 | 1 | 42,060 | Tommy John | Larry Gura | Larry Gura | Bruce Kison | Dan Quisenberry | 304 | 288 | 16 |
| 1984-06-24 | vs KCA | 72 | L 2-3 | 37-35 | 1 | 36,272 | Ron Romanick | Buddy Black | Buddy Black | Ron Romanick | Dan Quisenberry | 306 | 291 | 15 |
| 1984-06-25 | @ TEX | 73 | L 4-5 | 37-36 | 1 | 16,387 | Geoff Zahn | Dave Stewart | Dave J. Schmidt | Doug Corbett | | 310 | 296 | 14 |
| 1984-06-26 | @ TEX | 74 | W 3-2 | 38-36 | 1 | 19,010 | Jim Slaton | Charlie Hough | Bruce Kison | Odell Jones | | 313 | 298 | 15 |
| 1984-06-27 | @ TEX | 75 | W 2-1 | 39-36 | 1 | 18,988 | Mike Witt | Mike Mason | Mike Witt | Mike Mason | Luis Sanchez | 315 | 299 | 16 |
| 1984-06-28 | @ MIL | 76 | W 7-3 | 40-36 | 1 | 18,968 | Tommy John | Bob Gibson | Tommy John | Bob Gibson | Doug Corbett | 322 | 302 | 20 |
| 1984-06-29 | @ MIL | 77 | L 0-1 | 40-37 | 1 | 31,545 | Ron Romanick | Moose Haas | Moose Haas | Ron Romanick | Rollie Fingers | 322 | 303 | 19 |
| 1984-06-30 | @ MIL | 78 | W 2-0 | 41-37 | 1 | 37,218 | Geoff Zahn | Jaime Cocanower | Geoff Zahn | Jaime Cocanower | | 324 | 303 | 21 |
| 1984-07-01 | @ MIL | 79 | W 7-6 | 42-37 | 1 | 25,868 | Jim Slaton | Bob McClure | Bruce Kison | Bob McClure | Luis Sanchez | 331 | 309 | 22 |
| 1984-07-02 | @ TOR | 80 | W 6-3 | 43-37 | 1 | 29,227 | Mike Witt | Jim Clancy | Mike Witt | Jim Clancy | Don Aase | 337 | 312 | 25 |
| 1984-07-03 | @ TOR | 81 | L 0-4 | 43-38 | 1 | 26,255 | Tommy John | Jim Gott | Jim Gott | Tommy John | | 337 | 316 | 21 |
| 1984-07-04 | @ TOR | 82 | L 3-6 | 43-39 | 1 | 24,330 | Ron Romanick | Dave Stieb | Dave Stieb | Ron Romanick | | 340 | 322 | 18 |
| 1984-07-05 | @ BOS | 83 | L 7-12 | 43-40 | 1 | 19,885 | Geoff Zahn | Oil Can Boyd | Oil Can Boyd | Geoff Zahn | Bob Stanley | 347 | 334 | 13 |
| 1984-07-06 | @ BOS | 84 | L 7-8 | 43-41 | 3 | 29,655 | Jim Slaton | Al Nipper | Al Nipper | Jim Slaton | Mark Clear | 354 | 342 | 12 |
| 1984-07-08 | @ BOS | 85 | L 2-3 | 44-42 | 3 | 0 | Ron Romanick | Bruce Hurst | Bob Stanley | Luis Sanchez | | 356 | 345 | 11 |
| 1984-07-08 | @ BOS | 86 | W 4-0 | 44-42 | 3 | 34,682 | Tommy John | Roger Clemens | Tommy John | Roger Clemens | | 360 | 345 | 15 |
| 1984-07-12 | vs MIL | 87 | W 5-2 | 45-42 | 2 | 29,010 | Mike Witt | Jaime Cocanower | Mike Witt | Jaime Cocanower | | 365 | 347 | 18 |
| 1984-07-13 | vs MIL | 88 | L 4-5 | 45-43 | 2 | 22,523 | Geoff Zahn | Don Sutton | Don Sutton | Geoff Zahn | Rollie Fingers | 369 | 352 | 17 |
| 1984-07-14 | vs MIL | 89 | W 2-1 | 46-43 | 1 | 43,886 | Ron Romanick | Moose Haas | Ron Romanick | Tom Tellmann | | 371 | 353 | 18 |
| 1984-07-15 | vs MIL | 90 | W 7-6 | 47-43 | 1 | 30,881 | Tommy John | Chuck Porter | Luis Sanchez | Bob McClure | | 378 | 359 | 19 |
| 1984-07-16 | vs TOR | 91 | W 3-0 | 48-43 | 1 | 24,890 | Jim Slaton | Jim Gott | Jim Slaton | Jim Gott | | 381 | 359 | 22 |
| 1984-07-17 | vs TOR | 92 | W 5-3 | 49-43 | 1 | 27,176 | Mike Witt | Doyle Alexander | Mike Witt | Jim Acker | Don Aase | 386 | 362 | 24 |
| 1984-07-18 | vs TOR | 93 | L 2-8 | 49-44 | 1 | 28,634 | Geoff Zahn | Luis Leal | Luis Leal | Geoff Zahn | | 388 | 370 | 18 |
| 1984-07-20 | vs BOS | 94 | L 3-4 | 49-45 | 1 | 31,162 | Ron Romanick | Al Nipper | Bob Stanley | Don Aase | | 391 | 374 | 17 |
| 1984-07-21 | vs BOS | 95 | L 4-16 | 49-46 | 1 | 32,415 | Tommy John | Bruce Hurst | Bruce Hurst | Tommy John | | 395 | 390 | 5 |
| 1984-07-22 | vs BOS | 96 | L 0-3 | 49-47 | 1 | 30,551 | Jim Slaton | Bob Ojeda | Bob Ojeda | Jim Slaton | | 395 | 393 | 2 |
| 1984-07-23 | vs SEA | 97 | W 7-1 | 50-47 | 1 | 23,967 | Mike Witt | Mike Moore | Mike Witt | Mike Moore | | 402 | 394 | 8 |
| 1984-07-24 | vs SEA | 98 | L 3-4 | 50-48 | 1 | 24,834 | Geoff Zahn | Ed Vande Berg | Ed Vande Berg | Geoff Zahn | Mike Stanton | 405 | 398 | 7 |
| 1984-07-25 | vs SEA | 99 | W 1-0 | 51-48 | 1 | 23,634 | Ron Romanick | Jim Beattie | Luis Sanchez | Jim Beattie | | 406 | 398 | 8 |
| 1984-07-27 | @ MIN | 100 | L 0-2 | 51-49 | 1 | 30,536 | Tommy John | Mike Smithson | Mike Smithson | Tommy John | Ron Davis | 406 | 400 | 6 |
| 1984-07-28 | @ MIN | 101 | L 1-6 | 51-50 | 2 | 34,681 | Jim Slaton | Frank Viola | Frank Viola | Jim Slaton | | 407 | 406 | 1 |
| 1984-07-29 | @ MIN | 102 | L 5-6 | 51-51 | 2 | 30,311 | Mike Witt | John Butcher | Rick Lysander | Luis Sanchez | | 412 | 412 | 0 |
| 1984-07-30 | @ OAK | 103 | W 5-4 | 52-51 | 2 | 24,246 | Geoff Zahn | Curt Young | Doug Corbett | Bill Caudill | Luis Sanchez | 417 | 416 | 1 |
| 1984-07-31 | @ OAK | 104 | W 7-3 | 53-51 | 2 | 16,079 | Ron Romanick | Lary Sorensen | Ron Romanick | Lary Sorensen | | 424 | 419 | 5 |
| 1984-08-01 | @ OAK | 105 | W 6-4 | 54-51 | 2 | 19,199 | Tommy John | Bill Krueger | Tommy John | Bill Krueger | | 430 | 423 | 7 |
| 1984-08-02 | vs MIN | 106 | W 14-2 | 55-51 | 1 | 26,199 | Jim Slaton | Frank Viola | Jim Slaton | Frank Viola | | 444 | 425 | 19 |
| 1984-08-03 | vs MIN | 107 | L 2-4 | 55-52 | 2 | 28,837 | Mike Witt | John Butcher | John Butcher | Mike Witt | Ron Davis | 446 | 429 | 17 |
| 1984-08-04 | vs MIN | 108 | W 4-2 | 56-52 | 1 | 33,853 | Geoff Zahn | Pete Filson | Geoff Zahn | Pete Filson | Bruce Kison | 450 | 431 | 19 |
| 1984-08-05 | vs MIN | 109 | L 2-4 | 56-53 | 2 | 23,863 | Ron Romanick | Ken Schrom | Ken Schrom | Ron Romanick | Ron Davis | 452 | 435 | 17 |
| 1984-08-06 | @ SEA | 110 | W 8-4 | 57-53 | 2 | 12,085 | Tommy John | Salome Barojas | Tommy John | Salome Barojas | | 460 | 439 | 21 |
| 1984-08-07 | @ SEA | 111 | W 7-6 | 58-53 | 2 | 9,295 | Jim Slaton | Mike Moore | Don Aase | Mike Stanton | | 467 | 445 | 22 |
| 1984-08-08 | @ SEA | 112 | L 2-7 | 58-54 | 2 | 7,756 | Mike Witt | Mark Langston | Mark Langston | Mike Witt | Ed Nunez | 469 | 452 | 17 |
| 1984-08-09 | vs OAK | 113 | L 4-5 | 58-55 | 2 | 24,188 | Geoff Zahn | Curt Young | Curt Young | Geoff Zahn | Bill Caudill | 473 | 457 | 16 |
| 1984-08-10 | vs OAK | 114 | L 6-7 | 58-56 | 2 | 24,033 | Tommy John | Lary Sorensen | Keith Atherton | Luis Sanchez | Bill Caudill | 479 | 464 | 15 |
| 1984-08-11 | vs OAK | 115 | L 2-3 | 58-57 | 2 | 28,643 | Ron Romanick | Bill Krueger | Tom Burgmeier | Luis Sanchez | | 481 | 467 | 14 |
| 1984-08-12 | vs OAK | 116 | W 10-9 | 59-57 | 2 | 24,722 | Jim Slaton | Steve McCatty | Luis Sanchez | Bill Caudill | | 491 | 476 | 15 |
| 1984-08-14 | @ DET | 117 | W 6-4 | 61-57 | 2 | 0 | Mike Witt | Juan Berenguer | Don Aase | Guillermo Hernandez | Luis Sanchez | 497 | 480 | 17 |
| 1984-08-14 | @ DET | 118 | W 12-1 | 61-57 | 2 | 38,597 | Bruce Kison | Dave Rozema | Bruce Kison | Dave Rozema | | 509 | 481 | 28 |
| 1984-08-15 | @ DET | 119 | L 3-8 | 61-58 | 2 | 33,940 | Tommy John | Dan Petry | Dan Petry | Tommy John | | 512 | 489 | 23 |
| 1984-08-16 | @ DET | 120 | L 7-8 | 61-59 | 2 | 37,779 | Ron Romanick | Jack Morris | Guillermo Hernandez | John Curtis | | 519 | 497 | 22 |
| 1984-08-17 | @ BAL | 121 | L 5-6 | 61-60 | 2 | 29,432 | Jim Slaton | Scott McGregor | Scott McGregor | Jim Slaton | Sammy Stewart | 524 | 503 | 21 |
| 1984-08-18 | @ BAL | 122 | L 0-1 | 61-61 | 2 | 29,219 | Mike Witt | Mike Boddicker | Mike Boddicker | Mike Witt | | 524 | 504 | 20 |
| 1984-08-19 | @ BAL | 123 | L 4-10 | 61-62 | 2 | 25,823 | Bruce Kison | Mike Flanagan | Mike Flanagan | Bruce Kison | | 528 | 514 | 14 |
| 1984-08-20 | @ NYA | 124 | L 4-8 | 61-63 | 3 | 27,741 | Tommy John | Joe Cowley | Joe Cowley | Tommy John | | 532 | 522 | 10 |
| 1984-08-21 | @ NYA | 125 | L 2-8 | 61-64 | 3 | 28,960 | Ron Romanick | Phil Niekro | Phil Niekro | Ron Romanick | | 534 | 530 | 4 |
| 1984-08-22 | @ NYA | 126 | W 2-1 | 62-64 | 3 | 23,407 | Jim Slaton | Ray Fontenot | Jim Slaton | Ray Fontenot | Don Aase | 536 | 531 | 5 |
| 1984-08-24 | vs DET | 127 | W 5-3 | 63-64 | 3 | 41,459 | Mike Witt | Dan Petry | Mike Witt | Dan Petry | Don Aase | 541 | 534 | 7 |
| 1984-08-25 | vs DET | 128 | L 1-5 | 63-65 | 3 | 51,203 | Bruce Kison | Jack Morris | Jack Morris | Bruce Kison | | 542 | 539 | 3 |
| 1984-08-26 | vs DET | 129 | L 6-12 | 63-66 | 3 | 33,008 | Tommy John | Milt Wilcox | Milt Wilcox | Tommy John | | 548 | 551 | -3 |
| 1984-08-27 | vs BAL | 130 | L 6-7 | 63-67 | 3 | 23,440 | Ron Romanick | Storm Davis | Sammy Stewart | Luis Sanchez | | 554 | 558 | -4 |
| 1984-08-28 | vs BAL | 131 | W 4-2 | 64-67 | 3 | 25,729 | Jim Slaton | Scott McGregor | Jim Slaton | Scott McGregor | Don Aase | 558 | 560 | -2 |
| 1984-08-29 | vs BAL | 132 | W 7-5 | 65-67 | 3 | 25,191 | Mike Witt | Mike Boddicker | Doug Corbett | Mike Boddicker | | 565 | 565 | 0 |
| 1984-08-31 | vs NYA | 133 | W 4-3 | 66-67 | 3 | 30,219 | Bruce Kison | Dennis Rasmussen | John Curtis | Mike Armstrong | Don Aase | 569 | 568 | 1 |
| 1984-09-01 | vs NYA | 134 | W 11-6 | 67-67 | 2 | 40,077 | Geoff Zahn | Phil Niekro | Doug Corbett | Dave Righetti | | 580 | 574 | 6 |
| 1984-09-02 | vs NYA | 135 | L 3-5 | 67-68 | 3 | 26,530 | Ron Romanick | Ray Fontenot | Jay Howell | John Curtis | Dave Righetti | 583 | 579 | 4 |
| 1984-09-03 | @ CLE | 136 | L 5-6 | 67-69 | 3 | 6,655 | Jim Slaton | Steve Comer | Steve Comer | Jim Slaton | Jamie Easterly | 588 | 585 | 3 |
| 1984-09-04 | @ CLE | 137 | W 5-3 | 68-69 | 3 | 3,763 | Mike Witt | Don Schulze | Don Aase | Jamie Easterly | | 593 | 588 | 5 |
| 1984-09-05 | @ CLE | 138 | W 11-4 | 69-69 | 3 | 4,435 | Bruce Kison | Jose Roman | Bruce Kison | Jose Roman | | 604 | 592 | 12 |
| 1984-09-07 | @ CHA | 139 | W 16-8 | 70-69 | 3 | 26,086 | Geoff Zahn | Britt Burns | Geoff Zahn | Britt Burns | | 620 | 600 | 20 |
| 1984-09-08 | @ CHA | 140 | W 6-5 | 71-69 | 3 | 30,511 | Jim Slaton | Floyd Bannister | Luis Sanchez | Ron Reed | | 626 | 605 | 21 |
| 1984-09-09 | @ CHA | 141 | L 2-8 | 71-70 | 3 | 23,698 | Mike Witt | Tom Seaver | Tom Seaver | Mike Witt | | 628 | 613 | 15 |
| 1984-09-11 | vs CLE | 142 | L 2-4 | 71-71 | 3 | 20,673 | Ron Romanick | Don Schulze | Don Schulze | Ron Romanick | | 630 | 617 | 13 |
| 1984-09-12 | vs CLE | 143 | L 1-7 | 71-72 | 3 | 21,561 | Bruce Kison | Bert Blyleven | Bert Blyleven | Bruce Kison | | 631 | 624 | 7 |
| 1984-09-13 | vs CLE | 144 | W 7-3 | 72-72 | 3 | 20,827 | Jim Slaton | Jose Roman | Jim Slaton | Jose Roman | Don Aase | 638 | 627 | 11 |
| 1984-09-14 | vs CHA | 145 | W 5-0 | 73-72 | 3 | 28,376 | Geoff Zahn | Floyd Bannister | Geoff Zahn | Floyd Bannister | | 643 | 627 | 16 |
| 1984-09-15 | vs CHA | 146 | W 11-2 | 74-72 | 3 | 31,555 | Mike Witt | Tom Seaver | Mike Witt | Tom Seaver | | 654 | 629 | 25 |
| 1984-09-16 | vs CHA | 147 | W 4-2 | 75-72 | 3 | 26,931 | Ron Romanick | Richard Dotson | Ron Romanick | Richard Dotson | Don Aase | 658 | 631 | 27 |
| 1984-09-17 | vs KCA | 148 | L 1-10 | 75-73 | 3 | 28,862 | Bruce Kison | Buddy Black | Buddy Black | Bruce Kison | | 659 | 641 | 18 |
| 1984-09-18 | vs KCA | 149 | L 0-10 | 75-74 | 3 | 29,570 | Jim Slaton | Bret Saberhagen | Bret Saberhagen | Jim Slaton | | 659 | 651 | 8 |
| 1984-09-19 | vs KCA | 150 | W 4-3 | 76-74 | 2 | 29,094 | Geoff Zahn | Danny Jackson | Don Aase | Joe Beckwith | | 663 | 654 | 9 |
| 1984-09-20 | vs KCA | 151 | W 2-0 | 77-74 | 2 | 32,772 | Mike Witt | Mark Gubicza | Mike Witt | Mark Gubicza | | 665 | 654 | 11 |
| 1984-09-21 | vs TEX | 152 | W 5-4 | 78-74 | 2 | 27,479 | Ron Romanick | Danny Darwin | Curt Kaufman | Ricky Wright | | 670 | 658 | 12 |
| 1984-09-22 | vs TEX | 153 | L 7-9 | 78-75 | 3 | 23,240 | Tommy John | Mike Mason | Joey McLaughlin | Luis Sanchez | Tom Henke | 677 | 667 | 10 |
| 1984-09-23 | vs TEX | 154 | L 1-2 | 78-76 | 3 | 45,094 | Jim Slaton | Dave Stewart | Dave Stewart | Jim Slaton | | 678 | 669 | 9 |
| 1984-09-24 | @ KCA | 155 | L 0-4 | 78-78 | 3 | 0 | Geoff Zahn | Bret Saberhagen | Bret Saberhagen | Geoff Zahn | | 678 | 673 | 5 |
| 1984-09-24 | @ KCA | 156 | L 4-12 | 78-78 | 3 | 39,574 | Rick Steirer | Danny Jackson | Danny Jackson | Rick Steirer | | 682 | 685 | -3 |
| 1984-09-25 | @ KCA | 157 | L 5-6 | 78-79 | 3 | 20,320 | Mike Witt | Mark Gubicza | Dan Quisenberry | Curt Kaufman | | 687 | 691 | -4 |
| 1984-09-26 | @ KCA | 158 | W 2-0 | 79-79 | 3 | 22,728 | Ron Romanick | Buddy Black | Ron Romanick | Buddy Black | | 689 | 691 | -2 |
| 1984-09-27 | @ TEX | 159 | L 1-2 | 79-80 | 3 | 6,761 | Tommy John | Ricky Wright | Dickie Noles | Tommy John | | 690 | 693 | -3 |
| 1984-09-28 | @ TEX | 160 | L 1-4 | 79-81 | 3 | 7,050 | Jim Slaton | Dave Stewart | Dave Stewart | Jim Slaton | | 691 | 697 | -6 |
| 1984-09-29 | @ TEX | 161 | W 4-0 | 80-81 | 3 | 8,951 | Geoff Zahn | Frank Tanana | Geoff Zahn | Frank Tanana | | 695 | 697 | -2 |
| 1984-09-30 | @ TEX | 162 | W 1-0 | 81-81 | 3 | 8,375 | Mike Witt | Charlie Hough | Mike Witt | Charlie Hough | | 696 | 697 | -1 |