| 2025 | Jesse Chavez (st), Marc Church (Mar 27 onward) |
| 2024 | Nathaniel Lowe (st, Apr 20 onward) |
| 2023 | Nathaniel Lowe |
| 2022 | Nathaniel Lowe |
| 2021 | Nate Lowe |
| 2020 | Jesse Chavez |
| 2019 | Nomar Mazara (until Sep 22) |
| 2018 | Nomar Mazara |
| 2017 | Nomar Mazara |
| 2016 | Nomar Mazara |
| 2015 | Will Lamb (st), Neftali Feliz (until Jul 3), Will Venable (Aug 20 onward) |
| 2014 | Neftali Feliz (st, Jul 4 onward) |
| 2013 | Neftali Feliz (st, Sep 1 – 20) |
| 2012 | Neftali Feliz (until May 18) |
| 2011 | Neftali Feliz |
| 2010 | Neftali Feliz |
| 2009 | Kason Gabbard (st), Neftali Feliz (Aug 3 onward) NOTE: Darren O’Day (#56) wore Kason Gabbard’s uniform (#30) on his debut of Apr 22. |
| 2008 | Travis Metcalf (st, May 12 onward) |
| 2007 | Rick Bauer (st), Travis Metcalf (May 19 onward) |
| 2006 | Jason Botts (st), Rick Bauer (Apr 7 onward) |
| 2005 | Ricardo Rodriguez (st, Jun 12 – Aug 8) |
| 2004 | Ricardo Rodriguez (st, Jun 28 – Jul 22) |
| 2003 | Rob Bell (st) |
| 2002 | Bill Pulpisher (st), Rob Bell (Apr 27 – Aug 22) |
| 2001 | Francisco Cordero (st, Jun 22 – 25) |
| 2000 | Francisco Cordero |
| 1999 | Aaron Sele |
| 1998 | Aaron Sele |
| 1997 | Lonell Roberts (st), Hanley Frias (Jun 21 onward) |
| 1996 | Rikkert Faneyte (st, May 11 – 29) |
| 1995 | Hector Fajardo (st, May 30 – Jun 18), Sam Horn (Sep 1 – 20) |
| 1994 | Hector Fajardo (st, May 2 – Jul 30) |
| 1993 | Hector Fajardo (st, Oct 2 only) |
| 1992 | Mike Jeffcoat (st, May 19 – Jun 4, Sep 18 – 26) |
| 1991 | Mike Jeffcoat |
| 1990 | Mike Jeffcoat |
| 1989 | Mike Jeffcoat (st, Jun 2 onward) |
| 1988 | Mike Jeffcoat (until Apr 30, Sep 5 – 25) |
| 1987 | Mike Jeffcoat (st, Jun 8 – 15) |
| 1986 | Dave Rozema (until Apr 30) |
| 1985 | Dave Rozema |
| 1984 | Otto Gonzalez (st), Marv Foley (Apr 10 onward) |
| 1983 | Mark Wagner (st, Jun 3 – 11) |
| 1982 | Mark Wagner (until Jul 9) |
| 1981 | Mark Wagner |
| 1980 | Greg Mahlberg (st), Mike Hart (Jun 12 – 22) |
| 1979 | Steve Finch (st), Ed Farmer (Apr 14 – Jun 14), Greg Mahlberg (Sep 1 onward) |
| 1978 | Dave Rivera (st) |
| 1977 | Dave Moates (st), Eddie Miller (Sep 5 onward) |
| 1976 | Dave Moates |
| 1975 | Dave Moates (st, Jul 17 – Sep 26) |
| 1974 | Art DeFilippis (st), Lloyd Allen (Apr 4 – Jun 23), Dave Moates (Sep 21 only) |
| 1973 | Mike Paul (until Aug 29) |
| 1972 | Mike Paul |
Washington Senators Years |
|
| 1971 | Del Unser |
| 1970 | Del Unser |
| 1969 | Del Unser |
| 1968 | Del Unser |
| 1967 | Jim King (until Jun 15), Frank Coggins (Sep 10 – Oct 1) |
| 1966 | Jim King |
| 1965 | Jim King |
| 1964 | Jim King |
| 1963 | Jim King |
| 1962 | Jim King |
| 1961 | Jim King |
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