| 2023 | Ian Kennedy (until May 10) |
| 2022 | |
| 2021 | David Dahl (until Aug 1) |
| 2020 | Todd Frazier (until Aug 30) |
| 2019 | Patrick Wisdom (Apr 7 – Jul 5) |
| 2018 | Chi Chi Gonzalez (st) |
| 2017 | Chi Chi Gonzalez (st), Jeremy Jeffress (st) |
| 2016 | Chi Chi Gonzalez (st, Jun 27 – Jul 7) |
| 2015 | Kyuji Fujikawa (st, May 14 – 15), Chi Chi Gonzalez (May 30 onward) |
| 2014 | Alex Castellanos (st), Alec Asher (st), Carlos Pena (Jun 24 – Jul 16) |
| 2013 | Brandon Snyder (st), Chris McGuiness (Jun 6 – Jun 18) |
| 2012 | Brandon Snyder (until Sep 18) |
| 2011 | Brett Tomko |
| 2010 | Jarrod Saltamacchia (until Apr 7), Jeff Franceour (Aug 31 onward) |
| 2009 | Jarrod Saltamacchia (until Sep 5) |
| 2008 | Milton Bradley |
| 2007 | Sammy Sosa |
| 2006 | Adam Eaton (st, Jul 25 – Sep 27) |
| 2005 | Esteban German (st), Steve Karsay (Aug 4 onward) |
| 2004 | Jason Jones (st) |
| 2003 | Ruben Sierra (until Jun 6), Jason Jones (Jul 23 onward) |
| 2002 | Pat Borders (st), Calvin Murray (Apr 13 – Jun 9), Reynoldo Garcia (Jul 19 – 26), Todd Hollandsworth (Aug 1 onward) |
| 2001 | Ruben Mateo (until May 28), Craig Monroe (July 27th onward) |
| 2000 | Ruben Mateo (until Jun 2) |
| 1999 | Ruben Mateo (June 13th onward) |
| 1998 | Warren Newson (st, Aug 8 – Sep 27) |
| 1997 | Warren Newson |
| 1996 | Warren Newson |
| 1995 | Chris Willsher (replacement), John Dettmer (st, Apr 26), Jack Voigt (May 16 – Aug 21), Candy Maldonado (Sep 2 – 29) |
| 1994 | John Dettmer |
| 1993 | |
| 1992 | Ruben Sierra |
| 1991 | Ruben Sierra |
| 1990 | Ruben Sierra |
| 1989 | Ruben Sierra |
| 1988 | Ruben Sierra |
| 1987 | Edwin Correa (until Jul 5), Ruben Sierra (Jul 6 onward?) |
| 1986 | Duane Walker (st) |
| 1985 | Glenn Ezell (bullpen coach), Duane Walker (Jul 19 onward, also 59 but unknown dates) |
| 1984 | Odell Jones |
| 1983 | Odell Jones |
| 1982 | Pete O’Brien (st), Doug Flynn (until Jul 30) |
| 1981 | Dan Duran (until Jun 10) |
| 1980 | Dan Duran (st) |
| 1979 | Dan Duran (st) |
| 1978 | Mike Hargrove |
| 1977 | Mike Hargrove |
| 1976 | Mike Hargrove |
| 1975 | Mike Hargrove |
| 1974 | David Harper (st), Mike Hargrove |
| 1973 | Lenny Randle (st, Sep 17 – 29), Bill Sudakis |
| 1972 | Tom Ragland (st, Jul 27 onward) |
Washington Senators Years |
|
| 1971 | Curt Flood (Apr 5 – 25), Tom Ragland (Sep 24 – 30) |
| 1970 | Jim Shellenback |
| 1969 | Jan Dukes (st), Jim Shellenback, Jim Miles (Apr 12 – 18, Jul 19 – Aug 13, Sep 6 – 9) |
| 1968 | Doug Camilli (st), Bill Haywood (Jul 28 – Sep 11) |
| 1967 | Doug Camilli |
| 1966 | Doug Camilli |
| 1965 | Bennie Daniels |
| 1964 | Bennie Daniels |
| 1963 | Bennie Daniels |
| 1962 | Bennie Daniels |
| 1961 | Bennie Daniels |
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