| 2023 | Jacob DeGrom |
| 2022 | Brandon Workman (st) |
| 2021 | |
| 2020 | Rafael Montero (st) |
| 2019 | Rafael Montero |
| 2018 | Paulo Espino (st), Drew Hutchison (Aug 5 – Sep 2) |
| 2017 | |
| 2016 | Colby Lewis |
| 2015 | Colby Lewis |
| 2014 | Colby Lewis |
| 2013 | Colby Lewis |
| 2012 | Colby Lewis |
| 2011 | Colby Lewis |
| 2010 | Colby Lewis |
| 2009 | Thomas Diamond (st) |
| 2008 | John Rheinecker (st), Jim Colburn (coach, Aug 2 onwards) |
| 2007 | John Rheinecker |
| 2006 | Nick Regilio (st), John Rheinecker (Apr 22 only, May 29 onwards) |
| 2005 | Justin Thompson (st), Matt Riley (till May 6), Kevin Gryboski (Jul 21 onwards) |
| 2004 | Colby Lewis |
| 2003 | Colby Lewis |
| 2002 | Ismael Valdes (st only), Colby Lewis |
| 2001 | Larry Hardy (coach) |
| 2000 | Larry Hardy (coach) |
| 1999 | Larry Hardy (coach) |
| 1998 | |
| 1997 | Jose Alberro |
| 1996 | Jose Alberro |
| 1995 | Jose Alberro |
| 1994 | |
| 1993 | |
| 1992 | Gerald Alexander |
| 1991 | Gerald Alexander |
| 1990 | Gerald Alexander |
| 1989 | |
| 1988 | Scott May |
| 1987 | Scott Anderson |
| 1986 | Bobby Witt |
| 1985 | Dave Stewart |
| 1984 | |
| 1983 | Mike Smithson |
| 1982 | Mike Smithson |
| 1981 | |
| 1980 | Frank Lucchesi (coach) |
| 1979 | |
| 1978 | Bobby Thompson (no, not that one) |
| 1977 | Mike Bacsik |
| 1976 | Bill Singer |
| 1975 | |
| 1974 | |
| 1973 | Rick Henninger |
| 1972 | |
Washington Senators Years |
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| 1971 | |
| 1970 | |
| 1969 | |
| 1968 | |
| 1967 | |
| 1966 | |
| 1965 | |
| 1964 | |
| 1963 | |
| 1962 | |
| 1961 | |
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