The 2020 pitchers for the Mariners included Ian Hamilton, Andrés Muñoz, Domingo Tapia, Marco Gonzales and Justus Sheffield.
| NO. | NAME | POS | HEIGHT | WEIGHT | DOB | AGE | BIRTHPLACE | ||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 53 |  | D. Altavilla | P | 5'11" | 200 | 9/8/1992 | 27 | McKeesport, PA |
| 2 | 65 | | B. Brennan | P | 6'4" | 220 | 7/26/1991 | 28 | Mission Viejo, CA |
| 3 | 30 |  | N. Cortes | P | 5'11" | 210 | 12/10/1994 | 25 | Surgidero de Batabano, Cuba |
| 4 | 35 | | J. Dunn | P | 6'2" | 185 | 9/22/1995 | 24 | Freeport, NY |
| 5 | 16 | | C. Edwards Jr. | P | 6'3" | 170 | 9/3/1991 | 28 | Newberry, SC |
| 6 | 81 | | A. Fletcher | P | 6'0" | 220 | 2/25/1996 | 24 | Geneseo, IL |
| 7 | 60 | | S. Frankoff | P | 6'5" | 210 | 8/27/1988 | 31 | Raleigh, NC |
| 8 | 59 | | J. Gerber | P | 6'4" | 215 | 5/3/1997 | 23 | Maple Grove, MN |
| 9 | 7 | | M. Gonzales | P | 6'1" | 195 | 2/16/1992 | 28 | Fort Collins, CO |
| 10 | 49 | | K. Graveman | P | 6'2" | 200 | 12/21/1990 | 29 | Tallapoosa County, AL |
| 11 | 37 | | Z. Grotz | P | 6'2" | 195 | 2/17/1993 | 27 | San Mateo, CA |
| 12 | 45 | | T. Guilbeau | P | 6'4" | 180 | 5/12/1993 | 27 | Baton Rouge, LA |
| 13 | | I. Hamilton | P | 6'0" | 200 | 6/16/1995 | 25 | Dover, NH | |
| 14 | 6 | | Y. Hirano | P | 6'1" | 185 | 3/8/1984 | 36 | Uji, Kyoto, Japan |
| 15 | 18 |  | Y. Kikuchi | P | 6'0" | 194 | 6/17/1991 | 29 | Morioka, Japan |
| 16 | 62 | | B. Lail | P | 6'2" | 205 | 8/9/1993 | 26 | South Jordan, UT |
| 17 | 73 | | W. Lockett | P | 6'5" | 225 | 5/3/1994 | 26 | Jacksonville, FL |
| 18 | 61 | | M. Magill | P | 6'3" | 210 | 11/10/1989 | 30 | Simi Valley, CA |
| 19 | 52 | | N. Margevicius | P | 6'5" | 220 | 6/18/1996 | 24 | Cleveland, OH |
| 20 | 38 | | A. Misiewicz | P | 6'1" | 190 | 11/1/1994 | 25 | Detroit, MI |
| 21 |  | A. Muñoz | P | 6'2" | 165 | 1/16/1999 | 21 | Los Mochis, Mexico | |
| 22 | 74 | | L. Newsome | P | 5'11" | 210 | 11/8/1996 | 23 | La Plata, MD |
| 23 | 55 | | Y. Ramírez | P | 6'4" | 190 | 5/6/1995 | 25 | Villa Mella, Dominican Republic |
| 24 | 37 | | C. Sadler | P | 6'3" | 205 | 7/13/1990 | 29 | Stillwater, OK |
| 25 | 36 | | B. Shaw | P | 6'1" | 232 | 11/8/1987 | 32 | Livermore, CA |
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Team Batting Leaders 
HR
25
Arozarena
RBI
75
Arozarena
AVG
.278
Arozarena
Team Pitching Leaders 
W
12
Woo
K
194
Gilbert
ERA
3.57
Hancock
Team Rankings
HR
175
14th
R
624
28th
SO
1,301
12th
ERA
4.21
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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