| 1996+ | Retired – Nolan Ryan |
| 1995 | |
| 1994 | |
| 1993 | Nolan Ryan |
| 1992 | Nolan Ryan |
| 1991 | Nolan Ryan |
| 1990 | Nolan Ryan |
| 1989 | Nolan Ryan |
| 1988 | Dale Mohorcic, Steve Wilson |
| 1987 | Dale Mohorcic |
| 1986 | Tom Paciorek, Dale Mohorcic |
| 1985 | |
| 1984 | |
| 1983 | |
| 1982 | Paul Mirabella |
| 1981 | Jim Kern |
| 1980 | Jim Kern |
| 1979 | Jim Kern |
| 1978 | John Lowenstein |
| 1977 | Nelson Briles |
| 1976 | Nelson Briles |
| 1975 | Mike Bacsik, Bill Hands |
| 1974 | |
| 1973 | Art DeFilippis (st), Don Durham |
| 1972 | Roy Foster (st), Jim Roland |
Washington Senators Years |
|
| 1971 | Rick Stelmaszek |
| 1970 | George Brunet, Denny Riddleberger (Sep 15 – Oct 1) |
| 1969 | Rick Hense (st) |
| 1968 | Fred Valentine, Steve Jones (May 15-19, Sep 14-23) |
| 1967 | Fred Valentine |
| 1966 | Fred Valentine |
| 1965 | Buster Narum, Fred Valentine (Sep 11 – Oct 2) |
| 1964 | Don Zimmer (st), Buster Narum |
| 1963 | Brant Alyea (st), Lou Klimchock (Apr 13 – May 5), Don Zimmer (Jun 27 onwards) |
| 1962 | Claude Osteen, John Kennedy (Sep 5 – 30) |
| 1961 | Carl Bouldin, Claude Osteen |
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