Seattle Mariners vs Colorado Rockies Picks and Prediction for Sunday, September 20, 2026
The Seattle Mariners visit the Colorado Rockies on Sunday at Coors Field, with the opening pitch scheduled for 3:10 PM ET on MLB.TV. Seattle is 72-82, third in the AL West, five games behind Houston and Texas, and six games behind the third and final AL Wild Card position with eight games remaining. The Mariners have won two straight after beating Colorado 5-4 on Friday. Colorado is 56-98, fifth in the NL West, 38 games behind the Los Angeles Dodgers, and has been eliminated from postseason contention. The Rockies have lost three straight following Friday’s 5-4 loss. Check out our free MLB picks.
Seattle Mariners Preview
Seattle is batting .232 with a .312 on-base percentage and .381 slugging percentage, scoring 629 runs with 177 home runs. Randy Arozarena leads the Mariners with a .281 average, 25 home runs and 75 RBI while adding 23 stolen bases. Josh Naylor has a team-high 154 hits with a .272 average, while Dominic Canzone has 22 homers and 70 RBI. Julio Rodriguez has added 21 home runs, 66 RBI and 22 stolen bases.
The Mariners have a 4.21 ERA and 1.26 WHIP while opponents are batting .251. Seattle has recorded 1,310 strikeouts against 409 walks and has allowed 186 home runs. The Mariners have also been the better defensive team in this matchup, committing 79 errors with a .985 fielding percentage. Seattle has allowed four runs or fewer in three of its last five games.
Injuries: 3B Brendan Donovan, CF Brennen Davis, RP Cole Wilcox, 3B Will Wilson and SP Emerson Hancock are on the injured list.
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Colorado Rockies Preview
Colorado is batting .255 with a .324 on-base percentage and .418 slugging percentage while scoring 721 runs. TJ Rumfield leads the Rockies with a .300 average, 157 hits and a .392 on-base percentage. Hunter Goodman has supplied a team-high 38 home runs, while Jake McCarthy is batting .298 with 15 homers, 82 RBI and 31 stolen bases. The Rockies have scored 92 more runs than Seattle.
Colorado has a 5.61 ERA and 1.53 WHIP while allowing opponents to bat .289. The Rockies have recorded 1,058 strikeouts against 514 walks and have surrendered 899 runs. Colorado has allowed at least eight runs in three of its last five games. The Rockies have also committed 95 errors and carry a .982 fielding percentage.
Injuries: DH Kris Bryant, SP Jose Quintana, 2B Willi Castro, SP McCade Brown and SP Chase Dollander are on the injured list.
Pitching Matchup
Seattle Mariners - Kade Anderson
Anderson is 1-2 with a 5.33 ERA and 1.42 WHIP across 25.1 innings. The left-hander has allowed 28 hits and four home runs while recording 21 strikeouts and eight walks.
Colorado Rockies - Kyle Freeland
Freeland is 4-10 with a 6.38 ERA and 1.47 WHIP across 128.1 innings. The left-hander has allowed 161 hits and 27 home runs while recording 104 strikeouts and 28 walks.
Seattle Mariners vs Colorado Rockies Prediction
Colorado has the stronger offensive numbers, but Seattle has a sizable pitching advantage with a 4.21 team ERA compared with Colorado’s 5.61. Freeland has allowed 161 hits and 27 home runs, giving Seattle’s power hitters a favorable matchup. Anderson also carries a 5.33 ERA, so Colorado can produce runs at Coors Field, but the Mariners have the stronger overall staff and better defensive numbers. Seattle will extend its winning streak in another high-scoring game. Final Score Prediction: Seattle Mariners win, 7-6.
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