| 2025 | Jacob Webb |
| 2024 | Jack Leiter (st) |
| 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 onward) |
| 2019 | Jose Trevino (st) |
| 2018 | Jose Trevino (st, Jun 15 – 17) |
| 2017 | Jose Trevino (st) |
| 2016 | Sam Freeman (st) |
| 2015 | Jared Hoying (st), Sam Freeman (May 14 onward) |
| 2014 | |
| 2013 | Jim Adduci (st) |
| 2012 | Kelvin De La Cruz (st) |
| 2011 | Jose Felix (st) |
| 2010 | Matt Brown (st) |
| 2009 | John Bannister (st) |
| 2008 | Alexi Ogando (st) |
| 2007 | Daniel Haigwood (st) |
| 2006 | Armando Galarraga (st) |
| 2005 | Augustin Montero (st) |
| 2004 | Erick Burke (st) |
| 2003 | Rosman Garcia (st) |
| 2002 | Brad King (st) |
| 2001 | |
| 2000 | |
| 1999 | |
| 1998 | |
| 1997 | |
| 1996 | |
| 1995 | |
| 1994 | |
| 1993 | |
| 1992 | |
| 1991 | |
| 1990 | Pat Dodson (st) |
| 1989 | |
| 1988 | |
| 1987 | |
| 1986 | |
| 1985 | |
| 1984 | |
| 1983 | |
| 1982 | |
| 1981 | |
| 1980 | |
| 1979 | |
| 1978 | |
| 1977 | |
| 1976 | |
| 1975 | Roy Smalley (st) |
| 1974 | Roy Smalley (st) |
| 1973 | |
| 1972 | |
Washington Senators Years |
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| 1971 | |
| 1970 | |
| 1969 | |
| 1968 | |
| 1967 | |
| 1966 | |
| 1965 | |
| 1964 | |
| 1963 | |
| 1962 | |
| 1961 | |
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