| 2020 | Nick Ciuffo (st) |
| 2019 | Oscar Marin (bullpen coach) |
| 2018 | Alex Claudio |
| 2017 | Alex Claudio |
| 2016 | Alex Claudio |
| 2015 | Alex Claudio |
| 2014 | Joe Ortiz (minors) |
| 2013 | Joe Ortiz |
| 2012 | Mark Hamburger (until Jun 22; minors) |
| 2011 | Zack Jackson (st), Mark Hamburger (Sep 1 – Sep 28) |
| 2010 | Guillermo Moscoso |
| 2009 | Derrick Turnbow (st), Guillermo Moscoso (May 29 onwards) |
| 2008 | Wes Littleton |
| 2007 | Wes Littleton |
| 2006 | Brian Shouse (till May 12), Wes Littleton |
| 2005 | Brian Shouse |
| 2004 | Brian Shouse |
| 2003 | Brian Shouse |
| 2002 | Hector Carrasco (st) |
| 2001 | Mike Judd (May 30-Jun 21) |
| 2000 | |
| 1999 | |
| 1998 | Scott Bailes |
| 1997 | Scott Bailes |
| 1996 | |
| 1995 | Terry Gilmore (st replacement) |
| 1994 | |
| 1993 | |
| 1992 | |
| 1991 | |
| 1990 | |
| 1989 | |
| 1988 | |
| 1987 | |
| 1986 | |
| 1985 | |
| 1984 | |
| 1983 | |
| 1982 | |
| 1981 | |
| 1980 | |
| 1979 | |
| 1978 | |
| 1977 | |
| 1976 | |
| 1975 | |
| 1974 | |
| 1973 | |
| 1972 | |
Washington Senators Years |
|
| 1971 | Rick Kemp (st) |
| 1970 | |
| 1969 | Jack Jenkins (st) |
| 1968 | Dick Billings (st) |
| 1967 | Gene Martin (Listed as “In Military Service”) |
| 1966 | |
| 1965 | |
| 1964 | Barry Moore (st) |
| 1963 | |
| 1962 | |
| 1961 | |
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