| 2016 | Doug Brocail (Pitching coach) |
| 2015 | Anthony Ranaudo |
| 2014 | Robbie Ross |
| 2013 | Robbie Ross |
| 2012 | Robbie Ross (until Jul 31), Ryan Dempster (Aug 1 onwards) |
| 2011 | Pedro Strop |
| 2010 | Luis Mendoza (st), Pedro Strop (May 15 only) |
| 2009 | Luis Mendoza |
| 2008 | Luis Mendoza |
| 2007 | Bruce Chen |
| 2006 | Bobby Jones (coach) |
| 2005 | Doug Brocail |
| 2004 | Doug Brocail |
| 2003 | John Thomson |
| 2002 | Dennys Reyes (Aug 2 onwards) |
| 2001 | Mark Petkovsek |
| 2000 | Doug Davis |
| 1999 | Doug Davis |
| 1998 | |
| 1997 | Terry Clark |
| 1996 | Kevin Gross, Danny Patterson |
| 1995 | Kevin Gross |
| 1994 | |
| 1993 | |
| 1992 | Lance McCullers, Matt Whiteside |
| 1991 | |
| 1990 | |
| 1989 | |
| 1988 | Tony Fossas |
| 1987 | Mike Loynd |
| 1986 | Mike Loynd |
| 1985 | Burt Hooton |
| 1984 | Jeff Kunkel (st) |
| 1983 | Jim Anderson |
| 1982 | |
| 1981 | Bob Babcock |
| 1980 | Bob Babcock |
| 1979 | |
| 1978 | |
| 1977 | |
| 1976 | Jeff Terpko |
| 1975 | |
| 1974 | Jeff Terpko |
| 1973 | |
| 1972 | |
Washington Senators Years |
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| 1971 | |
| 1970 | |
| 1969 | |
| 1968 | |
| 1967 | |
| 1966 | |
| 1965 | |
| 1964 | |
| 1963 | |
| 1962 | |
| 1961 | |
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