| 90-72 | Missed Playoffs |
| Record | Outcome |
The Seattle Mariners finished the regular season with a 90-72 record. They went 46-35 at home and 44-37 on the road.
The 2021 Seattle Mariners played in the West Division of the American League.
During the regular season, the 2021 Seattle Mariners went 47-29 against their AL West opponents.
| Opponent | Record | Win Percentage % | Run Differential |
|---|---|---|---|
| Oakland Athletics | 15-4 | 78.9% | +17 |
| Texas Rangers | 13-6 | 68.4% | +10 |
| Los Angeles Angels | 11-8 | 57.9% | -12 |
| Houston Astros | 8-11 | 42.1% | -30 |
No, the Mariners didn't make the Postseason in 2021.
The Seattle Mariners finished the regular season with a run differential of -51. Based on their run differential and their pythagorean expectation, the Mariners could have been expected to have about 75.8 wins, or a 76-86 record in the regular season.
In one-run games, or games that went into extra innings, the 2021 Seattle Mariners went 39-20.
During the regular season, the 2021 Seattle Mariners went 13-7 in extra inning games.
The longest win streak during the regular season for the 2021 Seattle Mariners was a 6 game winning streak.
The longest losing streak that the Seattle Mariners had during the 2021 regular season was 6 games, which happened once during the season.
= Playoff Team
Bold = Division Opponent
| Date | Opponent | Score | |
|---|---|---|---|
| Regular Season | |||
| Thu, Apr 1, 2021 Thu, Apr 1 | vs San Francisco Giants | Win 8 - 7 | (10) |
| Fri, Apr 2, 2021 Fri, Apr 2 | vs San Francisco Giants | Loss 3 - 6 | |
| Sat, Apr 3, 2021 Sat, Apr 3 | vs San Francisco Giants | Win 4 - 0 | |
| Mon, Apr 5, 2021 Mon, Apr 5 | vs Chicago White Sox | Loss 0 - 6 | |
| Tue, Apr 6, 2021 Tue, Apr 6 | vs Chicago White Sox | Loss 4 - 10 | |
| Wed, Apr 7, 2021 Wed, Apr 7 | vs Chicago White Sox | Win 8 - 4 | |
| Thu, Apr 8, 2021 Thu, Apr 8 | @ Minnesota Twins | Loss 2 - 10 | |
| Sat, Apr 10, 2021 Sat, Apr 10 | @ Minnesota Twins | Win 4 - 3 | (10) |
| Sun, Apr 11, 2021 Sun, Apr 11 | @ Minnesota Twins | Win 8 - 6 | |
| Tue, Apr 13, 2021 Tue, Apr 13 | @ Baltimore Orioles | Loss 6 - 7 | |
| Tue, Apr 13, 2021 Tue, Apr 13 | @ Baltimore Orioles | Win 4 - 3 | |
| Thu, Apr 15, 2021 Thu, Apr 15 | @ Baltimore Orioles | Win 2 - 1 | |
| Thu, Apr 15, 2021 Thu, Apr 15 | @ Baltimore Orioles | Win 4 - 2 | |
| Fri, Apr 16, 2021 Fri, Apr 16 | vs Houston Astros | Win 6 - 5 | |
| Sat, Apr 17, 2021 Sat, Apr 17 | vs Houston Astros | Loss 0 - 1 | |
| Sun, Apr 18, 2021 Sun, Apr 18 | vs Houston Astros | Win 7 - 2 | |
| Mon, Apr 19, 2021 Mon, Apr 19 | vs Los Angeles Dodgers | Win 4 - 3 | |
| Tue, Apr 20, 2021 Tue, Apr 20 | vs Los Angeles Dodgers | Loss 0 - 1 | |
| Thu, Apr 22, 2021 Thu, Apr 22 | @ Boston Red Sox | Win 7 - 3 | (10) |
| Fri, Apr 23, 2021 Fri, Apr 23 | @ Boston Red Sox | Loss 5 - 6 | |
| Sat, Apr 24, 2021 Sat, Apr 24 | @ Boston Red Sox | Win 8 - 2 | |
| Sun, Apr 25, 2021 Sun, Apr 25 | @ Boston Red Sox | Loss 3 - 5 | |
| Mon, Apr 26, 2021 Mon, Apr 26 | @ Houston Astros | Loss 2 - 5 | |
| Tue, Apr 27, 2021 Tue, Apr 27 | @ Houston Astros | Loss 0 - 2 | |
| Wed, Apr 28, 2021 Wed, Apr 28 | @ Houston Astros | Loss 5 - 7 | |
| Thu, Apr 29, 2021 Thu, Apr 29 | @ Houston Astros | Win 1 - 0 | |
| Fri, Apr 30, 2021 Fri, Apr 30 | vs Los Angeles Angels | Win 7 - 4 | |
| Sat, May 1, 2021 Sat, May 1 | vs Los Angeles Angels | Loss 5 - 10 | |
| Sun, May 2, 2021 Sun, May 2 | vs Los Angeles Angels | Win 2 - 0 | |
| Mon, May 3, 2021 Mon, May 3 | vs Baltimore Orioles | Loss 3 - 5 | |
| Tue, May 4, 2021 Tue, May 4 | vs Baltimore Orioles | Win 5 - 2 | |
| Wed, May 5, 2021 Wed, May 5 | vs Baltimore Orioles | Loss 0 - 6 | |
| Fri, May 7, 2021 Fri, May 7 | @ Texas Rangers | Win 5 - 4 | |
| Sat, May 8, 2021 Sat, May 8 | @ Texas Rangers | Loss 8 - 9 | |
| Sun, May 9, 2021 Sun, May 9 | @ Texas Rangers | Loss 2 - 10 | |
| Tue, May 11, 2021 Tue, May 11 | @ Los Angeles Dodgers | Loss 4 - 6 | |
| Wed, May 12, 2021 Wed, May 12 | @ Los Angeles Dodgers | Loss 1 - 7 | |
| Thu, May 13, 2021 Thu, May 13 | vs Cleveland Indians | Loss 2 - 4 | |
| Fri, May 14, 2021 Fri, May 14 | vs Cleveland Indians | Win 7 - 3 | |
| Sat, May 15, 2021 Sat, May 15 | vs Cleveland Indians | Win 7 - 3 | |
| Sun, May 16, 2021 Sun, May 16 | vs Cleveland Indians | Win 3 - 2 | |
| Mon, May 17, 2021 Mon, May 17 | vs Detroit Tigers | Loss 1 - 4 | |
| Tue, May 18, 2021 Tue, May 18 | vs Detroit Tigers | Loss 0 - 5 | |
| Wed, May 19, 2021 Wed, May 19 | vs Detroit Tigers | Loss 2 - 6 | |
| Fri, May 21, 2021 Fri, May 21 | @ San Diego Padres | Loss 1 - 16 | |
| Sat, May 22, 2021 Sat, May 22 | @ San Diego Padres | Loss 4 - 6 | |
| Sun, May 23, 2021 Sun, May 23 | @ San Diego Padres | Loss 2 - 9 | |
| Mon, May 24, 2021 Mon, May 24 | @ Oakland Athletics | Win 4 - 2 | |
| Tue, May 25, 2021 Tue, May 25 | @ Oakland Athletics | Win 4 - 3 | |
| Wed, May 26, 2021 Wed, May 26 | @ Oakland Athletics | Loss 3 - 6 | |
| Thu, May 27, 2021 Thu, May 27 | vs Texas Rangers | Win 5 - 0 | |
| Fri, May 28, 2021 Fri, May 28 | vs Texas Rangers | Win 3 - 2 | |
| Sat, May 29, 2021 Sat, May 29 | vs Texas Rangers | Win 3 - 2 | |
| Sun, May 30, 2021 Sun, May 30 | vs Texas Rangers | Win 4 - 2 | |
| Mon, May 31, 2021 Mon, May 31 | vs Oakland Athletics | Win 6 - 5 | (10) |
| Tue, Jun 1, 2021 Tue, Jun 1 | vs Oakland Athletics | Loss 6 - 12 | |
| Wed, Jun 2, 2021 Wed, Jun 2 | vs Oakland Athletics | Loss 0 - 6 | |
| Thu, Jun 3, 2021 Thu, Jun 3 | @ Los Angeles Angels | Win 6 - 2 | |
| Fri, Jun 4, 2021 Fri, Jun 4 | @ Los Angeles Angels | Loss 2 - 3 | |
| Sat, Jun 5, 2021 Sat, Jun 5 | @ Los Angeles Angels | Loss 5 - 12 | |
| Sun, Jun 6, 2021 Sun, Jun 6 | @ Los Angeles Angels | Win 9 - 5 | |
| Tue, Jun 8, 2021 Tue, Jun 8 | @ Detroit Tigers | Loss 3 - 5 | |
| Wed, Jun 9, 2021 Wed, Jun 9 | @ Detroit Tigers | Win 9 - 6 | (11) |
| Thu, Jun 10, 2021 Thu, Jun 10 | @ Detroit Tigers | Loss 3 - 8 | |
| Fri, Jun 11, 2021 Fri, Jun 11 | @ Cleveland Indians | Loss 0 - 7 | |
| Sat, Jun 12, 2021 Sat, Jun 12 | @ Cleveland Indians | Loss 4 - 5 | (10) |
| Sun, Jun 13, 2021 Sun, Jun 13 | @ Cleveland Indians | Win 6 - 2 | |
| Mon, Jun 14, 2021 Mon, Jun 14 | vs Minnesota Twins | Win 4 - 3 | |
| Tue, Jun 15, 2021 Tue, Jun 15 | vs Minnesota Twins | Win 10 - 0 | |
| Wed, Jun 16, 2021 Wed, Jun 16 | vs Minnesota Twins | Loss 2 - 7 | |
| Thu, Jun 17, 2021 Thu, Jun 17 | vs Tampa Bay Rays | Win 6 - 5 | |
| Fri, Jun 18, 2021 Fri, Jun 18 | vs Tampa Bay Rays | Win 5 - 1 | |
| Sat, Jun 19, 2021 Sat, Jun 19 | vs Tampa Bay Rays | Win 6 - 5 | (10) |
| Sun, Jun 20, 2021 Sun, Jun 20 | vs Tampa Bay Rays | Win 6 - 2 | (10) |
| Tue, Jun 22, 2021 Tue, Jun 22 | vs Colorado Rockies | Win 2 - 1 | |
| Wed, Jun 23, 2021 Wed, Jun 23 | vs Colorado Rockies | Loss 2 - 5 | |
| Fri, Jun 25, 2021 Fri, Jun 25 | @ Chicago White Sox | Win 9 - 3 | |
| Sat, Jun 26, 2021 Sat, Jun 26 | @ Chicago White Sox | Win 3 - 2 | |
| Sun, Jun 27, 2021 Sun, Jun 27 | @ Chicago White Sox | Loss 5 - 7 | |
| Tue, Jun 29, 2021 Tue, Jun 29 | @ Toronto Blue Jays | Loss 3 - 9 | |
| Wed, Jun 30, 2021 Wed, Jun 30 | @ Toronto Blue Jays | Win 9 - 7 | (10) |
| Thu, Jul 1, 2021 Thu, Jul 1 | @ Toronto Blue Jays | Win 7 - 2 | |
| Fri, Jul 2, 2021 Fri, Jul 2 | vs Texas Rangers | Win 5 - 4 | (10) |
| Sat, Jul 3, 2021 Sat, Jul 3 | vs Texas Rangers | Loss 3 - 7 | |
| Sun, Jul 4, 2021 Sun, Jul 4 | vs Texas Rangers | Win 4 - 1 | |
| Tue, Jul 6, 2021 Tue, Jul 6 | vs New York Yankees | Loss 1 - 12 | |
| Wed, Jul 7, 2021 Wed, Jul 7 | vs New York Yankees | Loss 4 - 5 | |
| Thu, Jul 8, 2021 Thu, Jul 8 | vs New York Yankees | Win 4 - 0 | |
| Fri, Jul 9, 2021 Fri, Jul 9 | vs Los Angeles Angels | Win 7 - 3 | |
| Sat, Jul 10, 2021 Sat, Jul 10 | vs Los Angeles Angels | Win 2 - 0 | |
| Sun, Jul 11, 2021 Sun, Jul 11 | vs Los Angeles Angels | Loss 1 - 7 | |
| Fri, Jul 16, 2021 Fri, Jul 16 | @ Los Angeles Angels | Win 6 - 5 | |
| Sat, Jul 17, 2021 Sat, Jul 17 | @ Los Angeles Angels | Loss 4 - 9 | |
| Sun, Jul 18, 2021 Sun, Jul 18 | @ Los Angeles Angels | Win 7 - 4 | |
| Tue, Jul 20, 2021 Tue, Jul 20 | @ Colorado Rockies | Win 6 - 4 | |
| Wed, Jul 21, 2021 Wed, Jul 21 | @ Colorado Rockies | Loss 3 - 6 | |
| Thu, Jul 22, 2021 Thu, Jul 22 | vs Oakland Athletics | Loss 1 - 4 | |
| Fri, Jul 23, 2021 Fri, Jul 23 | vs Oakland Athletics | Win 4 - 3 | |
| Sat, Jul 24, 2021 Sat, Jul 24 | vs Oakland Athletics | Win 5 - 4 | |
| Sun, Jul 25, 2021 Sun, Jul 25 | vs Oakland Athletics | Win 4 - 3 | |
| Mon, Jul 26, 2021 Mon, Jul 26 | vs Houston Astros | Win 11 - 8 | |
| Tue, Jul 27, 2021 Tue, Jul 27 | vs Houston Astros | Loss 6 - 8 | |
| Wed, Jul 28, 2021 Wed, Jul 28 | vs Houston Astros | Loss 4 - 11 | |
| Fri, Jul 30, 2021 Fri, Jul 30 | @ Texas Rangers | Win 9 - 5 | |
| Sat, Jul 31, 2021 Sat, Jul 31 | @ Texas Rangers | Loss 4 - 5 | (10) |
| Sun, Aug 1, 2021 Sun, Aug 1 | @ Texas Rangers | Loss 3 - 4 | |
| Mon, Aug 2, 2021 Mon, Aug 2 | @ Tampa Bay Rays | Win 8 - 2 | |
| Tue, Aug 3, 2021 Tue, Aug 3 | @ Tampa Bay Rays | Win 4 - 2 | |
| Wed, Aug 4, 2021 Wed, Aug 4 | @ Tampa Bay Rays | Loss 3 - 4 | |
| Thu, Aug 5, 2021 Thu, Aug 5 | @ New York Yankees | Loss 3 - 5 | |
| Fri, Aug 6, 2021 Fri, Aug 6 | @ New York Yankees | Loss 2 - 3 | (11) |
| Sat, Aug 7, 2021 Sat, Aug 7 | @ New York Yankees | Loss 4 - 5 | |
| Sun, Aug 8, 2021 Sun, Aug 8 | @ New York Yankees | Win 2 - 0 | |
| Tue, Aug 10, 2021 Tue, Aug 10 | vs Texas Rangers | Loss 4 - 5 | (10) |
| Wed, Aug 11, 2021 Wed, Aug 11 | vs Texas Rangers | Win 2 - 1 | |
| Thu, Aug 12, 2021 Thu, Aug 12 | vs Texas Rangers | Win 3 - 1 | |
| Fri, Aug 13, 2021 Fri, Aug 13 | vs Toronto Blue Jays | Win 3 - 2 | |
| Sat, Aug 14, 2021 Sat, Aug 14 | vs Toronto Blue Jays | Win 9 - 3 | |
| Sun, Aug 15, 2021 Sun, Aug 15 | vs Toronto Blue Jays | Loss 3 - 8 | |
| Tue, Aug 17, 2021 Tue, Aug 17 | @ Texas Rangers | Win 3 - 1 | |
| Wed, Aug 18, 2021 Wed, Aug 18 | @ Texas Rangers | Win 3 - 1 | |
| Thu, Aug 19, 2021 Thu, Aug 19 | @ Texas Rangers | Win 9 - 8 | (11) |
| Fri, Aug 20, 2021 Fri, Aug 20 | @ Houston Astros | Loss 3 - 12 | |
| Sat, Aug 21, 2021 Sat, Aug 21 | @ Houston Astros | Loss 1 - 15 | |
| Sun, Aug 22, 2021 Sun, Aug 22 | @ Houston Astros | Win 6 - 3 | (11) |
| Mon, Aug 23, 2021 Mon, Aug 23 | @ Oakland Athletics | Win 5 - 3 | |
| Tue, Aug 24, 2021 Tue, Aug 24 | @ Oakland Athletics | Win 5 - 1 | |
| Thu, Aug 26, 2021 Thu, Aug 26 | vs Kansas City Royals | Loss 4 - 6 | |
| Fri, Aug 27, 2021 Fri, Aug 27 | vs Kansas City Royals | Loss 7 - 8 | (12) |
| Sat, Aug 28, 2021 Sat, Aug 28 | vs Kansas City Royals | Loss 2 - 4 | |
| Sun, Aug 29, 2021 Sun, Aug 29 | vs Kansas City Royals | Win 4 - 3 | |
| Mon, Aug 30, 2021 Mon, Aug 30 | vs Houston Astros | Loss 3 - 4 | |
| Tue, Aug 31, 2021 Tue, Aug 31 | vs Houston Astros | Win 4 - 0 | |
| Wed, Sep 1, 2021 Wed, Sep 1 | vs Houston Astros | Win 1 - 0 | |
| Fri, Sep 3, 2021 Fri, Sep 3 | @ Arizona Diamondbacks | Win 6 - 5 | (10) |
| Sat, Sep 4, 2021 Sat, Sep 4 | @ Arizona Diamondbacks | Win 8 - 5 | |
| Sun, Sep 5, 2021 Sun, Sep 5 | @ Arizona Diamondbacks | Win 10 - 4 | (11) |
| Mon, Sep 6, 2021 Mon, Sep 6 | @ Houston Astros | Loss 2 - 11 | |
| Tue, Sep 7, 2021 Tue, Sep 7 | @ Houston Astros | Loss 4 - 5 | (10) |
| Wed, Sep 8, 2021 Wed, Sep 8 | @ Houston Astros | Win 8 - 5 | |
| Fri, Sep 10, 2021 Fri, Sep 10 | vs Arizona Diamondbacks | Win 5 - 4 | |
| Sat, Sep 11, 2021 Sat, Sep 11 | vs Arizona Diamondbacks | Loss 3 - 7 | |
| Sun, Sep 12, 2021 Sun, Sep 12 | vs Arizona Diamondbacks | Loss 4 - 5 | |
| Mon, Sep 13, 2021 Mon, Sep 13 | vs Boston Red Sox | Win 5 - 4 | |
| Tue, Sep 14, 2021 Tue, Sep 14 | vs Boston Red Sox | Loss 4 - 8 | |
| Wed, Sep 15, 2021 Wed, Sep 15 | vs Boston Red Sox | Loss 4 - 9 | (10) |
| Fri, Sep 17, 2021 Fri, Sep 17 | @ Kansas City Royals | Win 6 - 2 | |
| Sat, Sep 18, 2021 Sat, Sep 18 | @ Kansas City Royals | Loss 1 - 8 | |
| Sun, Sep 19, 2021 Sun, Sep 19 | @ Kansas City Royals | Win 7 - 1 | |
| Mon, Sep 20, 2021 Mon, Sep 20 | @ Oakland Athletics | Win 4 - 2 | |
| Tue, Sep 21, 2021 Tue, Sep 21 | @ Oakland Athletics | Win 5 - 2 | |
| Wed, Sep 22, 2021 Wed, Sep 22 | @ Oakland Athletics | Win 4 - 1 | |
| Thu, Sep 23, 2021 Thu, Sep 23 | @ Oakland Athletics | Win 6 - 5 | |
| Fri, Sep 24, 2021 Fri, Sep 24 | @ Los Angeles Angels | Win 6 - 5 | |
| Sat, Sep 25, 2021 Sat, Sep 25 | @ Los Angeles Angels | Loss 1 - 14 | |
| Sun, Sep 26, 2021 Sun, Sep 26 | @ Los Angeles Angels | Win 5 - 1 | |
| Mon, Sep 27, 2021 Mon, Sep 27 | vs Oakland Athletics | Win 13 - 4 | |
| Tue, Sep 28, 2021 Tue, Sep 28 | vs Oakland Athletics | Win 4 - 2 | |
| Wed, Sep 29, 2021 Wed, Sep 29 | vs Oakland Athletics | Win 4 - 2 | |
| Fri, Oct 1, 2021 Fri, Oct 1 | vs Los Angeles Angels | Loss 1 - 2 | |
| Sat, Oct 2, 2021 Sat, Oct 2 | vs Los Angeles Angels | Win 6 - 4 | |
| Sun, Oct 3, 2021 Sun, Oct 3 | vs Los Angeles Angels | Loss 3 - 7 | |
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