The 2021 pitchers for the Mariners included Matt Brash, Joey Gerber, Ken Giles, Juan Then and Chris Flexen.
| NO. | NAME | POS | HEIGHT | WEIGHT | DOB | AGE | BIRTHPLACE | ||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 31 |  | T. Anderson | P | 6'3" | 215 | 12/30/1989 | 31 | Las Vegas, NV |
| 2 | 27 |  | M. Andriese | P | 6'2" | 225 | 8/28/1989 | 31 | Redlands, CA |
| 3 | 47 | | M. Brash | P | 6'1" | 170 | 5/12/1998 | 23 | Kingston, Canada |
| 4 | 63 | | D. Castillo | P | 6'3" | 250 | 1/18/1994 | 27 | Cabrera, Dominican Republic |
| 5 | 84 | | JT Chargois | P | 6'3" | 200 | 12/3/1990 | 30 | Sulphur, LA |
| 6 | 62 |  | S. Doolittle | P | 6'2" | 204 | 9/26/1986 | 34 | Rapid City, SD |
| 7 | 30 | | R. Dugger | P | 6'2" | 180 | 7/3/1995 | 25 | Tucson, AZ |
| 8 | 35 | | J. Dunn | P | 6'2" | 185 | 9/22/1995 | 25 | Freeport, NY |
| 9 | 41 | | A. Fletcher | P | 6'0" | 220 | 2/25/1996 | 25 | Geneseo, IL |
| 10 | 77 | | C. Flexen | P | 6'3" | 250 | 7/1/1994 | 27 | Newark, CA |
| 11 | 59 | | J. Gerber | P | 6'4" | 215 | 5/3/1997 | 24 | Maple Grove, MN |
| 12 | 36 |  | L. Gilbert | P | 6'6" | 225 | 5/5/1997 | 24 | Winter Park, FL |
| 13 | 58 | | K. Giles | P | 6'3" | 210 | 9/20/1990 | 30 | Albuquerque, NM |
| 14 | 7 | | M. Gonzales | P | 6'1" | 195 | 2/16/1992 | 29 | Fort Collins, CO |
| 15 | 49 | | K. Graveman | P | 6'2" | 200 | 12/21/1990 | 30 | Tallapoosa County, AL |
| 16 | 18 |  | Y. Kikuchi | P | 6'0" | 194 | 6/17/1991 | 30 | Morioka, Japan |
| 17 | 62 | | B. Lail | P | 6'2" | 205 | 8/9/1993 | 27 | South Jordan, UT |
| 18 | 52 | | N. Margevicius | P | 6'5" | 220 | 6/18/1996 | 25 | Cleveland, OH |
| 19 | 45 | | D. McCaughan | P | 6'1" | 195 | 3/18/1996 | 25 | Downey, CA |
| 20 | 99 | | K. Middleton | P | 6'3" | 215 | 9/12/1993 | 27 | Portland, OR |
| 21 | 40 | | W. Mills | P | 6'3" | 175 | 1/25/1995 | 26 | Spokane, WA |
| 22 | 38 | | A. Misiewicz | P | 6'1" | 190 | 11/1/1994 | 26 | Detroit, MI |
| 23 | 47 | | R. Montero | P | 6'0" | 185 | 10/17/1990 | 30 | Higuerito, Dominican Republic |
| 24 | 54 |  | A. Muñoz | P | 6'2" | 165 | 1/16/1999 | 22 | Los Mochis, Mexico |
| 25 | 74 | | L. Newsome | P | 5'11" | 210 | 11/8/1996 | 24 | La Plata, MD |
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Team Batting Leaders 
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25
Arozarena
RBI
75
Arozarena
AVG
.278
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Team Pitching Leaders 
W
12
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K
194
Gilbert
ERA
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Team Rankings
HR
175
14th
R
624
28th
SO
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12th
ERA
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20th
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MLB 2026 Batting Leaders
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MLB 2026 Standings
| NL East | W | L | PCT | GB |
|---|---|---|---|---|
89 | 64 | .582 | ||
85 | 68 | .556 | 4.0 | |
76 | 77 | .497 | 13.0 | |
71 | 82 | .464 | 18.0 | |
69 | 84 | .451 | 20.0 | |
| NL Central | W | L | PCT | GB |
 Brewers - y | 95 | 58 | .621 | |
85 | 68 | .556 | 10.0 | |
76 | 77 | .497 | 19.0 | |
75 | 78 | .490 | 20.0 | |
71 | 82 | .464 | 24.0 | |
| NL West | W | L | PCT | GB |
 Dodgers - y | 93 | 60 | .608 | |
84 | 69 | .549 | 9.0 | |
80 | 73 | .523 | 13.0 | |
64 | 89 | .418 | 29.0 | |
56 | 97 | .366 | 37.0 |
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