| 2024 | Jonathan Holder (st), Gerson Garabito (May 26 – Jun 7, Jul 24) |
| 2023 | Zack Littell (st), Alex Speas (Jul 19 – 24) |
| 2022 | DeMarcus Evans (st) |
| 2021 | Drew Anderson (st, Jul 30 onward) |
| 2020 | Nick Ciuffo (st) |
| 2019 | Oscar Marin (bullpen coach) |
| 2018 | Alex Claudio |
| 2017 | Alex Claudio |
| 2016 | Alex Claudio (st, Apr 13 onward) |
| 2015 | Alex Claudio (st, Apr 27 – Jun 23) |
| 2014 | Joe Ortiz (st) |
| 2013 | Joe Ortiz (until Sep 20) |
| 2012 | Mark Hamburger (st) |
| 2011 | Zack Jackson (st), Mark Hamburger (Aug 31 – Sep 26) |
| 2010 | Guillermo Moscoso (st, May 20 only) |
| 2009 | Derrick Turnbow (st), Guillermo Moscoso (May 30 onward) |
| 2008 | Wes Littleton |
| 2007 | Wes Littleton (st, May 5 onward) |
| 2006 | Brian Shouse (until Apr 21), Wes Littleton (Jul 4 onward) |
| 2005 | Brian Shouse |
| 2004 | Brian Shouse (st, May 16 onward) |
| 2003 | Brian Shouse (st, Apr 18 – Sep 23) |
| 2002 | Hector Carrasco (st) |
| 2001 | Jayson Durocher (st), Mike Judd (May 29 – Jun 12) |
| 2000 | RA Dickey (st) |
| 1999 | Mike Hubbard (st) |
| 1998 | Scott Bailes |
| 1997 | Corey Bailey (st), Scott Bailes (Aug 7 onward) |
| 1996 | Joey Vierra (st) |
| 1995 | Terry Gilmore (st replacement), Jerry Martin (st) |
| 1994 | Rusty Greer (st) |
| 1993 | Ritchie Moody (st) |
| 1992 | Chuck Jackson (st) |
| 1991 | |
| 1990 | |
| 1989 | |
| 1988 | |
| 1987 | |
| 1986 | |
| 1985 | Steve Buechele (st) |
| 1984 | Steve Buechele (st) |
| 1983 | Victor Cruz (st) |
| 1982 | |
| 1981 | |
| 1980 | |
| 1979 | |
| 1978 | |
| 1977 | |
| 1976 | |
| 1975 | Tommy Cruz (st) |
| 1974 | Ron Pruitt (st) |
| 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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