| Ben Bowden | P | Minors | N | 6-4 |
220 |
L-L |
1994-10-21 |
24.216 | Salem,Massachusetts |
 | AA | 2014-2019 | - | 2016- 2- 45-COL | 2019-04-01 | Assigned to Hartford (AA) | 2018-07-28 |
| Ty Culbreth | P | Minors | N | 6-0 |
180 |
L-L |
1994-04-09 |
25.046 | Bryan,Texas |
| AA | 2013-2019 | - | 2016- 8- 230-COL | 2019-04-01 | Assigned to Hartford (AA) | 2018-09-30 |
| Frank Duncan | P | Minors | N | 6-4 |
200 |
R-R |
1992-01-30 |
27.116 | San Diego,California |
| AAA | 2011-2018 | - | 2014-13- 401-PIT | 2018-06-15 | Assigned to Hartford (AA) | 2018-03-26 |
| Rico Garcia | P | Minors | N | 5-11 |
190 |
R-R |
1994-01-10 |
25.135 | Honolulu,Hawaii |
| AA | 2013-2019 | - | 2016-30- 890-COL | 2018-09-15 | Reinstated to active roster | 2017-07-28 |
| Rayan Gonzalez | P | Minors | N | 6-3 |
175 |
R-R |
1990-10-18 |
28.219 | Arecibo,Puerto Rico |
 | AA | 2009-2019 | - | 2012-21- 648-COL | 2019-03-31 | Outrighted to minors | 2019-03-08 |
| Ashton Goudeau | P | Minors | N | 6-6 |
205 |
R-R |
1992-07-23 |
26.306 | Bossier City,Louisiana |
| AAA | 2012-2019 | - | 2012-27- 823-KCA | 2019-04-01 | Assigned to Hartford (AA) | 2018-11-02 |
| Scott Griggs | P | Minors | N | 6-3 |
185 |
R-R |
1991-05-13 |
28.012 | Alamo,California |
| AA | 2010-2019 | - | 2012- 8- 266-LAN | 2019-04-23 | Reinstated to active roster | 2017-08-02 |
| Alexander Guillen | P | Minors | N | 6-2 |
175 |
R-R |
1995-11-23 |
23.184 | San Cristobal,Dom Rep |
 | AA | 2013-2019 | - | 2013- UDFA-COL | 2019-04-01 | Assigned to Hartford (AA) | 2017-08-15 |
| Mitch Horacek | P | Minors | N | 6-5 |
185 |
L-L |
1991-12-03 |
27.174 | Littleton,Colorado |
| AAA | 2011-2019 | - | 2013- 9- 279-BAL | 2019-05-10 | Assigned to Hartford (AA) | 2019-05-04 |
| Justin Lawrence | p | Minors | Y | 6-4 |
220 |
R-R |
1994-11-25 |
24.181 | Jacksonville,Florida |
| AAA | 2014-2019 | - | 2015-12- 347-COL | 2019-03-11 | Assigned to Hartford (AA) | 2018-11-20 |
| Chris Rusin | RP | DL-10 | Y | 6-2 |
185 |
L-L |
1986-10-22 |
32.215 | Detroit,Michigan |
| MLB | 2006-2019 | 2012-2018 | 2009- 4- 140-CHN | 2019-05-18 | Assigned to Hartford (AA) for rehab | 2019-05-05 |
| Craig Schlitter | P | Minors | N | 6-0 |
190 |
R-R |
1992-05-16 |
27.009 | Guilford,Connecticut |
| AAA | 2011-2018 | - | 2014-27- 803-COL | 2018-08-15 | Activated from disabled list | 2018-06-27 |
| Jack Wynkoop | P | Minors | N | 6-5 |
185 |
L-L |
1993-11-02 |
25.204 | Virginia Beach,Virginia |
| AA | 2013-2019 | - | 2015- 6- 167-COL | 2018-09-21 | Activated from disabled list | 2016-06-23 |
| Arvicent Perez | C | Minors | N | 5-10 |
178 |
R-R |
1994-01-14 |
25.131 | Ciudad Bolivar,Venezuela |
 | AA | 2014-2019 | - | | 2019-04-09 | Assigned to Hartford (AA) | 2019-03-22 |
| Brian Serven | C | Minors | N | 6-0 |
195 |
R-R |
1995-05-05 |
24.020 | Palm Desert,California |
| AA | 2014-2019 | - | 2016- 5- 140-COL | 2019-04-01 | Assigned to Hartford (AA) | 2017-05-30 |
| Brandon Bednar | 2B-SS | Minors | N | 6-4 |
170 |
R-R |
1992-03-21 |
27.065 | Stuart,Florida |
| AA | 2011-2018 | - | 2013- 7- 222-SFN | 2018-06-21 | Assigned to Hartford (AA) | 2018-06-21 |
| Bret Boswell | IF | Minors | N | 5-11 |
170 |
L-R |
1994-10-04 |
24.233 | Rockwall,Texas |
| AA | 2015-2019 | - | 2017- 8- 236-COL | 2019-04-01 | Assigned to Hartford (AA) | 2018-07-30 |
| Scotty Burcham | IF | DL-7 | N | 5-11 |
165 |
R-R |
1993-06-17 |
25.342 | Palm Desert,California |
| AA | 2012-2019 | - | 2015-25- 737-COL | 2019-05-03 | DL-7 Injured | 2019-03-25 |
| Brandon Gold | 3B-P | Minors | N | 6-3 |
192 |
R-R |
1994-09-16 |
24.251 | Atlanta,Georgia |
| AA | 2014-2019 | - | 2016-12- 350-COL | 2019-05-15 | Reinstated to active roster | 2017-06-30 |
| Reid Humphreys | SS | DL-7 | N | 6-1 |
201 |
R-R |
1994-11-21 |
24.185 | Brandon,Mississippi |
| AA | 2014-2019 | - | 2016- 7- 200-COL | 2019-04-09 | DL-7 Injured | 2018-06-07 |
| Mylz Jones | IF | Minors | N | 6-1 |
165 |
R-R |
1994-04-13 |
25.042 | Palmdale,California |
| AAA | 2013-2019 | - | 2015-13- 377-COL | 2019-05-10 | Assigned to Hartford (AA) | 2019-04-27 |
| Ryan Metzler | IF | Minors | N | 6-1 |
170 |
R-R |
1993-03-20 |
26.066 | Glen Burnie,Maryland |
| AAA | 2012-2019 | - | 2014- 9- 264-TOR | 2019-04-19 | Assigned to Hartford (AA) | 2019-04-07 |
| Tyler Nevin | 3B | Minors | N | 6-4 |
200 |
R-R |
1997-05-29 |
21.361 | Van Nuys,California |
| AA | 2015-2019 | - | 2015- 1- 38-COL | 2019-04-01 | Assigned to Hartford (AA) | 2018-06-24 |
| Chris Rabago | IF-C | Minors | N | 5-11 |
180 |
R-R |
1993-04-22 |
26.033 | Riverside,California |
| AAA | 2012-2019 | - | 2014-13- 383-COL | 2019-05-07 | Assigned to Hartford (AA) | 2019-05-02 |
| Alan Trejo | IF-P | Minors | N | 6-1 |
170 |
R-R |
1996-05-30 |
22.360 | Los Angeles,California |
| AA | 2015-2019 | - | 2017-16- 476-COL | 2019-04-01 | Assigned to Hartford (AA) | 2017-06-23 |
| Vance Vizcaino | SS | Minors | N | 6-4 |
215 |
L-R |
1994-08-01 |
24.297 | Durham,North Carolina |
| AA | 2013-2019 | - | 2016-11- 343-KCA | 2019-04-17 | Assigned to Hartford (AA) | 2018-05-04 |
| Colton Welker | 3B | Minors | N | 6-0 |
205 |
R-R |
1997-10-09 |
21.228 | Coral Springs,Florida |
| AA | 2016-2019 | - | 2016- 4- 110-COL | 2019-04-01 | Assigned to Hartford (AA) | 2017-08-24 |
| Willie Abreu | RF | DL-7 | N | 6-3 |
210 |
L-L |
1995-03-21 |
24.065 | Hialeah,Florida |
| AA | 2014-2019 | - | 2016- 6- 170-COL | 2019-05-15 | DL-7 Injured | 2018-09-02 |
| Vince Fernandez | OF | Minors | N | 6-4 |
205 |
R-L |
1995-07-25 |
23.305 | Livermore,California |
| AA | 2014-2019 | - | 2016-10- 290-COL | 2019-04-01 | Assigned to Hartford (AA) | 2018-09-02 |
| Heath Holder | OF | Minors | N | 6-5 |
215 |
R-R |
1992-08-23 |
26.275 | Loganville,Georgia |
| AA | 2012-2019 | - | 2016-25- 740-COL | 2019-04-01 | Assigned to Hartford (AA) | 2018-07-18 |
| Manuel Melendez | OF | Minors | N | 5-11 |
165 |
L-L |
1997-01-10 |
22.135 | Barquisimeto,Venezuela |
| AA | 2014-2019 | - | | 2019-04-01 | Assigned to Hartford (AA) | 2017-05-18 |
