| Ryan Castellani | P | Minors | N | 6-4 |
195 |
R-R |
1996-04-01 |
22.025 | Phoenix,Arizona |
AA | 2014-2017 | - | 2014- 2- 48-COL | 2017-06-27 | Reinstated to active roster |
| Parker French | p | Minors | N | 6-2 |
225 |
R-R |
1993-03-19 |
25.038 | Melbourne,Australia |
AA | 2012-2017 | - | 2015- 5- 137-COL | 2017-10-04 | Activated from disabled list |
| D.J. Johnson | P | Minors | N | 6-4 |
235 |
L-R |
1989-08-30 |
28.239 | Beaverton,Oregon |
AA | 2010-2017 | - | | 2017-11-01 | Signed to minor league contract (re-signed) |
| Craig Schlitter | P | Minors | N | 6-0 |
190 |
R-R |
1992-05-16 |
25.345 | Guilford,Connecticut |
AA | 2011-2017 | - | 2014-27- 803-COL | 2017-08-24 | Reinstated to active roster |
| Jesus Tinoco | P | Minors | Y | 6-4 |
190 |
R-R |
1995-04-30 |
22.362 | San Antonio de Maturin,Venezuela |
A+ | 2012-2017 | - | | 2018-03-10 | Assigned to Hartford (AA) |
| Jack Wynkoop | p | Minors | N | 6-5 |
185 |
L-L |
1993-11-02 |
24.175 | Virginia Beach,Virginia |
AA | 2013-2017 | - | 2015- 6- 167-COL | 2017-08-31 | Reinstated to active roster |
| Jan Vazquez | C | Minors | N | 5-10 |
165 |
B-R |
1991-04-29 |
26.363 | San Lorenzo,Puerto Rico |
AAA | 2009-2017 | - | 2009- 6- 187-LAN | 2017-11-10 | Signed to minor league contract (re-signed) |
| Josh Fuentes | 3B | Minors | N | 6-2 |
215 |
R-R |
1993-12-19 |
24.128 | Trabuco Hills,California |
AA | 2013-2017 | - | | 2017-09-01 | Reinstated to active roster |
| Ryan Metzler | IF | Minors | N | 6-1 |
170 |
R-R |
1993-03-20 |
25.037 | Glen Burnie,Maryland |
AA | 2012-2017 | - | 2014- 9- 264-TOR | 2017-08-19 | Assigned to Hartford (AA) |
| Brian Mundell | 1b | Minors | N | 6-3 |
225 |
R-R |
1994-02-28 |
24.057 | Santa Clarita,California |
AA | 2013-2017 | - | 2015- 7- 197-COL | 2017-10-04 | Activated from disabled list |
| Dom Nunez | 3B | Minors | N | 6-0 |
170 |
L-R |
1995-01-17 |
23.099 | Elk Grove,California |
AA | 2013-2017 | - | 2013- 6- 169-COL | 2017-04-06 | Assigned to Hartford (AA) |
| Anthony Phillips | SS | Minors | N | 5-9 |
160 |
R-R |
1990-04-11 |
28.015 | Cape Town,South Africa |
AAA | 2007-2017 | - | | 2017-10-29 | Signed to minor league contract (re-signed) |
| Matt Pierpont | IF-P | Minors | N | 6-2 |
202 |
R-R |
1991-01-25 |
27.091 | Canonsburg,Pennsylvania |
AA | 2010-2017 | - | 2013-26- 769-COL | 2017-05-04 | Assigned to Hartford (AA) |
| Chris Rabago | IF-C | Minors | Y | 5-11 |
180 |
R-R |
1993-04-22 |
25.004 | Riverside,California |
A+ | 2012-2017 | - | 2014-13- 383-COL | 2018-03-10 | Assigned to Hartford (AA) |
| Drew Weeks | SS | Minors | N | 6-2 |
180 |
R-R |
1993-06-09 |
24.321 | Orange Park,Florida |
AA | 2012-2017 | - | 2014- 7- 203-COL | 2017-04-06 | Assigned to Hartford (AA) |
| Omar Carrizales | OF | Minors | N | 6-0 |
175 |
L-L |
1995-01-30 |
23.086 | Maracay,Venezuela |
AA | 2013-2017 | - | 2012- UDFA-COL | 2016-08-26 | Activated from disabled list |
| Yonathan Daza | OF | Minors | Y | 6-2 |
190 |
R-R |
1994-02-28 |
24.057 | Maracay,Venezuela |
A+ | 2011-2017 | - | | 2018-03-10 | Assigned to Hartford (AA) |
