| 2025 | Tyler Mahle |
| 2024 | Tyler Mahle (st, Aug 6 onward) |
| 2023 | Yerry Rodriguez (st), Will Smith (Apr 2 onward) |
| 2022 | Matt Bush (until Jul 29), Yerry Rodriguez (Oct 5 only) |
| 2021 | Matt Bush (st, Apr 3 – 7, Oct 3) |
| 2020 | Sam Travis (st1) |
| 2019 | Matt Bush (st), Pedro Payano (Jul 6 – Aug 15) |
| 2018 | Matt Bush (until Jun 13) |
| 2017 | Matt Bush |
| 2016 | Jeremy Guthrie (st), Matt Bush (May 13 onward) |
| 2015 | Ross Ohlendorf (st, May 17 – Jun 3, Sep 1 – Oct 3), Wandy Rodriguez (May 11 – Jul 28 – conflict) |
| 2014 | Alex Rios (until Sep 4) |
| 2013 | Justin Grimm (until Jul 12), Alex Rios (Aug 10 onward) |
| 2012 | Kyle Hudson (st), Justin Grimm (Jun 16 – Jul 3, Sep 18 – 26) |
| 2011 | Omar Beltre (st), Mike Gonzalez (Sep 2 – 27) |
| 2010 | Max Ramirez (until Jun 30) |
| 2009 | Max Ramirez (st) |
| 2008 | Elizardo Ramirez (st, Jun 4 only), Max Ramirez (Jun 22 – Jul 26, Sep 15 – 28) |
| 2007 | Alexi Ogando (st), Willie Eyre (Apr 21 – Aug 16) |
| 2006 | Jon Leicester (st), Fabio Castro (Apr 6 – Jun 18) |
| 2005 | Richard Hidalgo (until Aug 4) |
| 2004 | Gerald Laird (st), Nick Bierbrodt (Jun 16 – Jul 6), Mike Bacsik (Aug 4 – 14) |
| 2003 | Gerald Laird (st, Apr 30 onward) |
| 2002 | Anthony Telford (st), Juan Alvarez (May 28 onward) |
| 2001 | Mike Munoz (st), R.A. Dickey (Apr 19 onward) |
| 2000 | Mike Munoz (until Apr 26) |
| 1999 | Mike Munoz |
| 1998 | Todd van Poppel (until Jul 13) |
| 1997 | Mike Simms (st) |
| 1996 | Mark Brandenburg (until Jul 26) |
| 1995 | Mark Brandenburg (Jul 20 – Sep 20) |
| 1994 | |
| 1993 | Jeff Bronkey (st, May 2 onward) |
| 1992 | Jeff Frye (st) |
| 1991 | Cedric Shaw (st) |
| 1990 | Ramon Manon (st, Apr 19 only) |
| 1989 | Cecilio Guante |
| 1988 | Dave Meier (st), Cecilio Guante (Sep 1 onward) |
| 1987 | Dave Meier (st, Sep 10 onward) |
| 1986 | Al Lachowicz (st), Bob Brower (Sep 3 onward) |
| 1985 | Al Lachowicz (st) |
| 1984 | Al Lachowicz (st) |
| 1983 | Al Lachowicz (st, Sep 13 & Oct 2) |
| 1982 | Tracy Cowger (st, media guide has him as Tracy this year) |
| 1981 | Terry Cowger (st, media guide has him as Terry, not Tracy) |
| 1980 | |
| 1979 | Wayne Pinkerton (st) |
| 1978 | |
| 1977 | Joe Russell (st) |
| 1976 | Joe Russell (st) |
| 1975 | Frank Bolick (st) |
| 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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