| 2022 | Meibrys Viloria (st, Jun 21 – Aug 25), Dallas Keuchel (Aug 27 – Sep 3) |
| 2021 | John King |
| 2020 | Luke Farrell |
| 2019 | Luke Farrell |
| 2018 | Erik Goeddel (st), Carlos Perez (May 3 onwards) |
| 2017 | Anthony Bass (Apr 25 – May 3) |
| 2016 | Jayce Tingler (Coach) |
| 2015 | |
| 2014 | Nate Adcock (st), Chris Gimenez (Mar 31 only, May 20 – Aug 3), Guilder Rodriguez (Sep 7 onwards) |
| 2013 | Coty Woods (st) |
| 2012 | Fabio Castillo (st) |
| 2011 | Fabio Castillo (st) |
| 2010 | Warner Madrigal (st) |
| 2009 | Warner Madrigal |
| 2008 | Warner Madrigal |
| 2007 | Willie Eyre (till Aug 16) |
| 2006 | Nick Trzesniak (st) |
| 2005 | Jason Standridge (st) |
| 2004 | Danny Ardoin (st), Bobby Jones (September only coach) |
| 2003 | R.A. Dickey (st), Bob Missick (Sep 1-3; roaving minor league scout/coach) |
| 2002 | R.A. Dickey (st) |
| 2001 | |
| 2000 | |
| 1999 | |
| 1998 | Julio Santana |
| 1997 | Julio Santana |
| 1996 | |
| 1995 | Bert Gerhart (st replacement) |
| 1994 | |
| 1993 | |
| 1992 | |
| 1991 | |
| 1990 | |
| 1989 | |
| 1988 | |
| 1987 | |
| 1986 | |
| 1985 | |
| 1984 | |
| 1983 | |
| 1982 | |
| 1981 | |
| 1980 | |
| 1979 | |
| 1978 | |
| 1977 | |
| 1976 | |
| 1975 | |
| 1974 | |
| 1973 | Bill Jurges (coach) |
| 1972 | |
Washington Senators Years |
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| 1971 | |
| 1970 | Jackie Brown (st) |
| 1969 | |
| 1968 | |
| 1967 | |
| 1966 | |
| 1965 | |
| 1964 | |
| 1963 | |
| 1962 | |
| 1961 | |
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