[REVISION HISTORY]

Seattle Mariners MLB betting odds and series updates

Updated 3 times since CLSTR started tracking revisions of this situation.

What changed

2026-08-08 23:51 UTC → 2026-08-09 07:21 UTC · added ~~removed~~

The betting market continued to favor the Seattle Mariners in early August 2026. On August 6, the Mariners opened as home favorites at –125 against the Detroit Tigers, who were listed at +100. Roughly 83% of money-line wagers backed Seattle, reflecting sharp confidence in Bryce Miller’s 1.34 ERA at home versus Detroit left-hander Framber Valdez’s recent struggles. A day later, the Mariners entered a three-game series with the league-leading Tampa Bay Rays. Despite the Rays’ 68-46 record and a five-game AL East lead, Seattle remained a slight favorite at –118, with the Rays at +100, a line analysts described as a “coin-flip” pricing. The opener featured Logan Gilbert (8-6, 3.46 ERA) for Seattle against Drew Rasmussen (10-5, 2.91 ERA) for Tampa Bay, who holds a 1.40 career ERA versus the Mariners. On August 7, the Rays defeated the Mariners 2-1 at T-Mobile Park, defying the pre-game betting bias. Drew Rasmussen delivered a dominant seven-inning scoreless performance with eight strikeouts, while Jonny DeLuca and Jonathan Aranda provided solo home runs for Tampa Bay. Logan Gilbert took the loss, pitching 6 2/3 innings and allowing two runs. Seattle's offense struggled, managing only a single run via a ninth-inning home run from Julio Rodríguez. The loss dropped the Mariners to a 56-61 record. The team faces additional challenges in the American League playoff race following injuries, including a left oblique strain to reliever Cole Wilcox. On August 8, the Tampa Bay Rays defeated the Mariners 3-2. Richie Palacios hit a two-run single in the sixth inning and Victor Mesa Jr. hit a solo home run to help secure the win. Seattle’s scoring came via two solo home runs from Josh Naylor, but the Rays' bullpen held the lead.

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