| 2020 | Julio Rangel (Pitching Coach) |
| 2019 | Hunter Pence (st), Julio Rangel (Pitching Coach) |
| 2018 | Clayton Blackburn (st), Eliezer Alvarez (May 7 only) |
| 2017 | Sam Dyson (until Jun 1), Clayton Blackburn (Jul 31 onwards) |
| 2016 | Sam Dyson |
| 2015 | Ross Detwiler (until Jul 10), Sam Dyson (Aug 1 onwards) |
| 2014 | Joe Saunders (Apr 4 – Jun 30), Phil Irwin (Jul 8-9 only) |
| 2013 | Justin Miller (st) |
| 2012 | Justin Miller (st) |
| 2011 | Dave Bush (until Jul 1) |
| 2010 | Kasey Kiker (st) |
| 2009 | Elizardo Ramirez (st) |
| 2008 | A.J. Murray |
| 2007 | A.J. Murray |
| 2006 | John Wasdin (until Jun 30) |
| 2005 | John Wasdin |
| 2004 | John Wasdin (st), Nick Bierbrodt (st), John Wasdin |
| 2003 | Todd van Poppel, Tony Mounce (Jun 13 – Jun 18), Shane Spencer (Jun 19 onwards) |
| 2002 | Todd van Poppel |
| 2001 | Reid Nichols (coach) |
| 2000 | |
| 1999 | |
| 1998 | |
| 1997 | Tanyon Sturtze |
| 1996 | |
| 1995 | Steve Lienhard (st replacement) |
| 1994 | Bruce Hurst |
| 1993 | |
| 1992 | Kevin Reimer |
| 1991 | Kevin Reimer |
| 1990 | Kevin Reimer |
| 1989 | Kevin Reimer |
| 1988 | Kevin Reimer |
| 1987 | |
| 1986 | Ruben Sierra |
| 1985 | |
| 1984 | |
| 1983 | |
| 1982 | |
| 1981 | |
| 1980 | Fred Koenig (st?) |
| 1979 | |
| 1978 | |
| 1977 | |
| 1976 | |
| 1975 | |
| 1974 | |
| 1973 | Rick Waits (Sep 17 only) |
| 1972 | |
Washington Senators Years |
|
| 1971 | |
| 1970 | |
| 1969 | |
| 1968 | |
| 1967 | |
| 1966 | |
| 1965 | |
| 1964 | George Case (coach, st) |
| 1963 | |
| 1962 | |
| 1961 | Tom Sturdivant, Roy Heiser (Sep 2 – 11) |
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