| 2024 | Jesus Tinoco (st, May 23 – Jun 15), Andrew Chafin (Jul 31 onward) |
| 2023 | Brett Martin (st) |
| 2022 | Brett Martin (until Sep 16) |
| 2021 | Brett Martin |
| 2020 | Brett Martin (st, Aug 1 onward) |
| 2019 | Connor Sadzeck (st), Brett Martin (Apr 19 onward) |
| 2018 | Connor Sadzeck (st, Sep 1 – 29) |
| 2017 | Connor Sadzeck (st), Anthony Carter (st) |
| 2016 | Connor Sadzeck (st) |
| 2015 | Lisalverto Bonilla (st) |
| 2014 | Lisalverto Bonilla (st, Sep 4 – 24) |
| 2013 | Collin Balester (st), Travis Blackley (Aug 20 – Sep 13) |
| 2012 | Sean Green (st) |
| 2011 | Yhency Brazoban (st), Ryan Tucker (Apr 29 to May 9) |
| 2010 | Clay Rapada (st, Sep 3 onward) |
| 2009 | Josh Rupe (until Apr 17) |
| 2008 | Josh Rupe |
| 2007 | Josh Rupe (st) |
| 2006 | Josh Rupe (st, Jul 30 onward) |
| 2005 | Jeff Zimmerman (st), Josh Rupe (Sep 16 onward) |
| 2004 | Jeff Zimmerman (st) |
| 2003 | Jeff Zimmerman (st) |
| 2002 | Jeff Zimmerman (st) |
| 2001 | Jeff Zimmerman |
| 2000 | Jeff Zimmerman |
| 1999 | Jeff Zimmerman (st, Apr 13 onward) |
| 1998 | Roger Pavlik (until Apr 23) |
| 1997 | Roger Pavlik (until May 6, Sep 5 – 27) |
| 1996 | Roger Pavlik |
| 1995 | Roger Pavlik |
| 1994 | Roger Pavlik (st, May 15 – Aug 6) |
| 1993 | Roger Pavlik (st, May 22 onward) |
| 1992 | Roger Pavlik (st, May 2 onward) |
| 1991 | Roger Pavlik (st) |
| 1990 | |
| 1989 | |
| 1988 | |
| 1987 | |
| 1986 | Paul Kilgus (st) |
| 1985 | Duane Walker (Jul 19 onward, also 21 but unknown dates) |
| 1984 | Marv Foley (st) |
| 1983 | Carlos Ibarra (st) |
| 1982 | |
| 1981 | |
| 1980 | |
| 1979 | |
| 1978 | |
| 1977 | |
| 1976 | |
| 1975 | Greg Pryor (st) |
| 1974 | Jim Sundberg (st) |
| 1973 | Ken Suarez (st) |
| 1972 | |
Washington Senators Years |
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| 1971 | |
| 1970 | |
| 1969 | |
| 1968 | Jack Jenkins (st) |
| 1967 | |
| 1966 | |
| 1965 | |
| 1964 | Tom DeHart (st) |
| 1963 | |
| 1962 | |
| 1961 | |
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