| 2022 | Matt Bush (until Aug 1), Yerry Rodriguez (Aug 14 onwards) |
| 2021 | Matt Bush |
| 2020 | Sam Travis (st1) |
| 2019 | Matt Bush, Pedro Payano (Jul 6 onwards) |
| 2018 | Matt Bush |
| 2017 | Matt Bush |
| 2016 | Jeremy Guthrie (st), Matt Bush (May 13 onwards) |
| 2015 | Andrew Faulkner (st), Wandy Rodriguez, Ross Ohlendorf (May 17 – Jun 3) |
| 2014 | Alex Rios |
| 2013 | Justin Grimm (until Jul 22), Alex Rios (Aug 9 onwards) |
| 2012 | Kyle Hudson (st), Justin Grimm (Jun 16 onwards) |
| 2011 | Omar Beltre (st), Mike Gonzalez (Sep 1 onwards) |
| 2010 | Max Ramirez (till Jun 30) |
| 2009 | Max Ramirez |
| 2008 | Elizardo Ramirez (until June 7), Max Ramirez (June 21 – July 27) |
| 2007 | Alexi Ogando (st), Willie Eyre (Apr 21 onwards) |
| 2006 | Jon Leicester (st), Fabio Castro (till Jun 24) |
| 2005 | Richard Hidalgo |
| 2004 | Gerald Laird (st), Nick Bierbrodt (Jun 15 – Jul 6), Mike Bacsik (Jul 31 onwards) |
| 2003 | Gerald Laird (Sep 2 onwards) |
| 2002 | Anthony Telford (st), Juan Alvarez |
| 2001 | R.A. Dickey (Apr 19 onwards) |
| 2000 | Mike Munoz |
| 1999 | Mike Munoz |
| 1998 | Todd van Poppel |
| 1997 | |
| 1996 | Mark Brandenburg |
| 1995 | Mark Brandenburg |
| 1994 | |
| 1993 | Jeff Bronkey |
| 1992 | |
| 1991 | |
| 1990 | Ramon Manon |
| 1989 | Cecilio Guante |
| 1988 | Cecilio Guante |
| 1987 | Dave Meier |
| 1986 | Bob Brower |
| 1985 | |
| 1984 | |
| 1983 | Al Lachowicz |
| 1982 | |
| 1981 | |
| 1980 | |
| 1979 | |
| 1978 | |
| 1977 | |
| 1976 | |
| 1975 | |
| 1974 | |
| 1973 | Chuck Hiller (coach) |
| 1972 | Rick Stelmaszek (st) |
Washington Senators Years |
|
| 1971 | Tom Ragland (st) |
| 1970 | Mike Thompson (st) |
| 1969 | Wayne Brescher (st) |
| 1968 | Gene Martin (st) |
| 1967 | Bob Parchem (st) |
| 1966 | Gary Holman (st) |
| 1965 | Gary Holman (st) |
| 1964 | George Angel (st) |
| 1963 | |
| 1962 | John Kennedy (st) |
| 1961 | |
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