| 2020 | Henry Ramos (st1), Demarcus Evans (st2 – Jul 16 onward) |
| 2019 | Ariel Hernandez (st), Phillips Valdez (Jun 8 only) |
| 2018 | Ronald Guzman (Apr 13 onwards) |
| 2017 | Ronald Guzman (st) |
| 2016 | Patrick Kivlehan (st) |
| 2015 | David Martinez (st) |
| 2014 | Justin Germano (May 8 – 13), Nate Adcock (Jul 24 – Aug 13) |
| 2013 | Juan Apodaca (st) |
| 2012 | Ben Snyder (st), Bobby Jones (Sep Coach) |
| 2011 | Zack Phillips (st) |
| 2010 | Zack Phillips (st) |
| 2009 | Derek Holland (st) |
| 2008 | Bill White (st) |
| 2007 | Kevin Richardson (st) |
| 2006 | Edison Volquez (st) |
| 2005 | John Danks (st) |
| 2004 | Mike Bacsik (st) |
| 2003 | Laynce Nix (st) |
| 2002 | Gerald Laird (st) |
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Washington Senators Years |
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| 1971 | |
| 1970 | Merritt Ranew (st) |
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