| 2024 | Jonathan Ornelas (st), Wyatt Langford |
| 2023 | Spencer Howard (st, Jun 9 – Jul 28), Jonathan Ornelas (Aug 7 – Sep 17) Wyatt Langford (contract signing pc only) |
| 2022 | Nick Tropeano (st), Albert Abreu (Apr 11 – May 28) |
| 2021 | Hyeon-jong Yang (Apr 26 – Sep 13) |
| 2020 | Edinson Volquez (until Aug 11) |
| 2019 | Edinson Volquez (until Apr 4, Sep 1 onward) |
| 2018 | Mike Minor |
| 2017 | Dillon Gee (until Jun 14), Miguel Gonzalez (Sep 6 onward) |
| 2016 | Steve Johnson (st), Jared Hoying (May 23 – Jul 25), Carlos Beltran (Aug 2 onward) |
| 2015 | Jon Edwards (until Jun 21) |
| 2014 | Miles Mikolas (st, May 14 – 17 dnp, Jul 1 onward) |
| 2013 | Joe Nathan |
| 2012 | Joe Nathan |
| 2011 | C.J. Wilson |
| 2010 | C.J. Wilson |
| 2009 | C.J. Wilson |
| 2008 | C.J. Wilson (until Aug 5) |
| 2007 | C.J. Wilson |
| 2006 | C.J. Wilson |
| 2005 | Vladimir Nunez (st), C.J. Wilson (Jun 10 onward) |
| 2004 | Mickey Calloway (until Aug 21) |
| 2003 | Marshall McDougall (st), Mario Ramos (Jun 19 – 29), Mickey Calloway (Aug 30 onward) |
| 2002 | Mario Ramos (st) |
| 2001 | Chris Haney (st), Mike Hubbard (May 6 – Jun 13) |
| 2000 | Corey Lee (st) |
| 1999 | Mike Morgan |
| 1998 | Bobby Witt (until Jun 15), Greg Cadaret (Aug 28 onward) |
| 1997 | Bobby Witt |
| 1996 | Bobby Witt |
| 1995 | Terrell Lowery (st), Bobby Witt (Aug 12 onward) |
| 1994 | Desi Wilson (st), Tim Leary (Jul 2 onward) |
| 1993 | Barry Manuel (st), Steve Balboni (Sep 13 & Oct 2) |
| 1992 | Bobby Witt (until Aug 29) |
| 1991 | Bobby Witt (until Sep 17) |
| 1990 | Bobby Witt |
| 1989 | Bobby Witt |
| 1988 | Bobby Witt |
| 1987 | Bobby Witt |
| 1986 | Willie Lozado (st) |
| 1985 | Dickie Noles |
| 1984 | Dwayne Henry (st, Sep 7 only), Dickie Noles (Jul 2 – Sep 27) |
| 1983 | Dwayne Henry (st) |
| 1982 | Lamar Johnson (st) |
| 1981 | |
| 1980 | Gaylord Perry (until Aug 10) |
| 1979 | |
| 1978 | |
| 1977 | Gaylord Perry |
| 1976 | Gaylord Perry |
| 1975 | Ron Norman (st), Gaylord Perry (Jun 15 onward) |
| 1974 | Rick Henninger (st), Don Stanhouse (May 26 onward) |
| 1973 | Bill Madlock (st, Sep 7 onward) |
| 1972 | |
Washington Senators Years |
|
| 1971 | Ed Stroud (st) |
| 1970 | Ed Stroud |
| 1969 | Ed Stroud |
| 1968 | Ed Stroud |
| 1967 | Frank Kreutzer (st – listed as “on Hawaii roster”), Ed Stroud (Jun 16 onward) |
| 1966 | Joe Coleman (st, Sep 26 only) |
| 1965 | Ed Hobaugh (st), Joe Coleman (Sep 28 & Oct 3) |
| 1964 | Bob Decker (st) |
| 1963 | Dalton Renfroe (st), John Kennedy (May 28 – Jul 7), Ed Hobaugh (Sep 2 – 27) |
| 1962 | Dave Tyriver (st) |
| 1961 | |
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