| 2025 | Justin Foscue (st) |
| 2024 | Justin Foscue (st, Apr 5 – 7, Jul 20 onward) |
| 2023 | Reyes Moronta (st) |
| 2022 | Kole Calhoun |
| 2021 | Brett De Geus (until Jun 22), Dennis Santana (Jul 3 onward) |
| 2020 | Jose Trevino (until Sep 9) |
| 2019 | Tony Sanchez (st), Jose Trevino (Aug 3 onward) |
| 2018 | Austin Bibens-Dirkx (st, May 24 – Sep 12) |
| 2017 | Andrew Faulkner (st), Austin Bibens-Dirkx (May 17 onward) |
| 2016 | Andrew Faulkner (until May 18 & Sep 25) |
| 2015 | Jerad Eickhoff (st), Andrew Faulkner (Aug 31 onward) |
| 2014 | Neal Cotts |
| 2013 | Neal Cotts (st, May 21 onward) |
| 2012 | Mitch Stetter (st) |
| 2011 | Darren O’Day |
| 2010 | Darren O’Day |
| 2009 | Brian Gordon (st), Darren O’Day (Apr 22 onward) NOTE: O’Day wore Kason Gabbard’s uniform on Apr 22 – #30 |
| 2008 | Dom Chiti (bullpen coach – until Aug 1), Bill White (Aug 28 – Sep 26) |
| 2007 | Dom Chiti (bullpen coach) |
| 2006 | Dom Chiti (bullpen coach) |
| 2005 | Michael Tejera (st, Jun 7 – 9) |
| 2004 | Rosman Garcia (st, May 27 – Aug 8), Michael Tejera (Sep 12 onward) |
| 2003 | Fernando Lunar (st), Rosman Garcia (Apr 19 onward) |
| 2002 | Jovanny Cedeno (st), Ben Kozlowski (Sep 19 – 28) |
| 2001 | Kevin Foster (st, Jul 6 – Aug 21) |
| 2000 | Edwin Diaz (st) |
| 1999 | Danny Patterson |
| 1998 | Danny Patterson |
| 1997 | Danny Patterson |
| 1996 | Danny Patterson (st, Sep 18 – 27) |
| 1995 | Danny Patterson (st) |
| 1994 | Duff Brumley (st) |
| 1993 | Benny Distefano (st) |
| 1992 | Jose Oliva (st) |
| 1991 | Mark Petkovsek (st, Jun 8 – 19) |
| 1990 | Mark Petkovsek (st) |
| 1989 | |
| 1988 | Chad Kreuter (st) |
| 1987 | Chad Kreuter (st) |
| 1986 | Greg Tabor (st) |
| 1985 | Randy Asadoor (st) |
| 1984 | Tommy Burgess (st coach) |
| 1983 | Tommy Burgess (st coach) |
| 1982 | Mike Mason (st) |
| 1981 | |
| 1980 | |
| 1979 | Keith Smith (st) |
| 1978 | |
| 1977 | |
| 1976 | |
| 1975 | Dick Gernert (st coach) |
| 1974 | |
| 1973 | Jim Merritt (until Sep 26) |
| 1972 | |
Washington Senators Years |
|
| 1971 | Rick Henninger (st) |
| 1970 | Gary Ratliff (st) |
| 1969 | Dick Such (st) |
| 1968 | Gerry Schoen (st) |
| 1967 | Dick Billings (st) |
| 1966 | |
| 1965 | |
| 1964 | Frank Coggins (st) |
| 1963 | |
| 1962 | |
| 1961 | |
Thank you for this site. Went to an autograph session years ago and had a baseball signed but the signature was unreadable. Fast forward a few years and I had no idea who signed this baseball. Thank goodness he inked his uniform number below the signature. At that time 56 belonged to Austin Bibens Dirkx