MLB · SEA at COL
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Woo’s recent pitching supports Seattle’s case, but Colorado’s unconfirmed starter complicates both the side and the total.
The Seattle Mariners visit the Colorado Rockies at Coors Field on September 18, 2026, with first pitch scheduled for 8:10 p.m. EDT. MLB.com confirms the 2026 MLB matchup and lists Bryan Woo as Seattle’s probable starter.
Woo has a 3.88 ERA and 163 strikeouts this season. His last five starts listed by Covers show improvement: a 2.70 ERA while averaging six innings, 6.2 strikeouts and 1.4 walks. On September 12 against the Athletics, he allowed three hits and one unearned run across six innings, with five strikeouts and two walks.
Those results support Seattle’s pitching case. The Mariners are priced at -186 on the moneyline, however, and a favorable recent stretch alone does not establish value at that price.
Covers presents Gabriel Hughes as Colorado’s starter, while MLB.com lists the assignment as TBD. Hughes’ numbers therefore describe a possible opponent for Woo, rather than a confirmed matchup.
Hughes has a 5.82 ERA over his last five listed starts. His September 13 outing at Detroit lasted two innings, with five hits, five earned runs, two walks, two strikeouts and one home run allowed.
Colorado’s broader results also raise concerns. Field Level Media reports that the Rockies lost 9-2 to San Diego on September 17, their 10th defeat in 11 games. Tanner Gordon lasted three innings. Covers separately lists 13 innings and six earned runs for Colorado’s bullpen over its prior three games. That workload deserves consideration, but it does not establish which relievers will be available.
Seattle’s run line is -1.5 (-120), while Colorado is +156 on the moneyline and +1.5 (+100) on the run line. The evidence does not establish a reliable winning-margin expectation to support either run line.
The total is 10.5, with over 10.5 (-105) and under 10.5 (-115). Colorado’s pitching struggles warrant attention, but the unresolved starter and missing offensive matchup evidence leave neither direction sufficiently supported.
Pass. Woo’s recent performance provides a reason to consider Seattle, but the available information does not justify a wager or a precise score projection.