| 2021 | Jason Martin |
| 2020 | Tim Federowicz (st) |
| 2019 | Zac Curtis (st), Tim Federowicz (Jun 7 – Jul 31) |
| 2018 | Keone Kela (until Jul 30) |
| 2017 | Keone Kela |
| 2016 | Keone Kela |
| 2015 | Michael Kirkman (st), Keone Kela |
| 2014 | Michael Kirkman |
| 2013 | Michael Kirkman |
| 2012 | Cody Eppley (st), Michael Kirkman (Jun 12 onwards) |
| 2011 | Jose Ruiz (st), Cody Eppley (Apr 23 onwards) |
| 2010 | Frank Francisco |
| 2009 | Frank Francisco |
| 2008 | Frank Francisco |
| 2007 | Frank Francisco |
| 2006 | Frank Francisco |
| 2005 | Frank Francisco |
| 2004 | Ben Kozlowski (st), Frank Francisco |
| 2003 | C.J. Nitkowski (till Apr 17), Robert Ellis (Jul 21-Aug 17) |
| 2002 | Jason Hart (st), Randy Flores, C.J. Nitkowski (Aug 20 onwards) |
| 2001 | Jonathan Johnson (till Apr 27), Brandon Villafuerte (Jul 25 onwards) |
| 2000 | Jonathan Johnson |
| 1999 | Jonathan Johnson |
| 1998 | Jonathan Johnson |
| 1997 | |
| 1996 | |
| 1995 | |
| 1994 | Tom Henke |
| 1993 | Tom Henke |
| 1992 | |
| 1991 | |
| 1990 | Gary Mielke |
| 1989 | Gary Mielke |
| 1988 | Gary Mielke |
| 1987 | Gary Mielke |
| 1986 | Mickey Mahler |
| 1985 | |
| 1984 | |
| 1983 | |
| 1982 | |
| 1981 | |
| 1980 | |
| 1979 | |
| 1978 | |
| 1977 | |
| 1976 | |
| 1975 | |
| 1974 | |
| 1973 | |
| 1972 | Dave Moates (st), Jan Dukes |
Washington Senators Years |
|
| 1971 | Larry Biittner (st) |
| 1970 | Jeff Terpko (st) |
| 1969 | Toby Harrah (st) |
| 1968 | |
| 1967 | Bill Gogolewski (listed as “In Military Service”) |
| 1966 | Casey Cox (st) |
| 1965 | Bob Richmond (st) |
| 1964 | Frank Garnett (st) |
| 1963 | |
| 1962 | Dalton Renfroe (st) |
| 1961 | |
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