| 2023 | Jonathan Ornelas (st) |
| 2022 | Joe McCarthy (st) & Doug Mathis (pitching coach) |
| 2021 | Anderson Tejeda (st) & Doug Mathis (pitching coach) |
| 2020 | Derek Law (st1, st2 until Jul 15), Anderson Tejeda (Aug 2 onwards) |
| 2019 | Jose Trevino (st) |
| 2018 | Jose Trevino |
| 2017 | Jose Trevino (st) |
| 2016 | Sam Freeman (st) |
| 2015 | Jared Hoying (st), Sam Freeman (May 14 onwards) |
| 2014 | |
| 2013 | James Adduci (st) |
| 2012 | Kelvin De La Cruz (st) |
| 2011 | Jose Felix (st) |
| 2010 | Matt Brown (st) |
| 2009 | John Bannister (st) |
| 2008 | |
| 2007 | Daniel Haigwood (st) |
| 2006 | Armando Galarraga (st) |
| 2005 | Augustin Montero (st) |
| 2004 | Erick Burke (st) |
| 2003 | Rosman Garcia (st) |
| 2002 | Brad King (st) |
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Washington Senators Years |
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