Prediction markets put the probability at 64%: Seattle Mariners vs. Houston Astros. Currently, markets are divided (64% YES, 36% NO). Seattle Mariners @ Houston Astros.
The Seattle Mariners vs. Houston Astros matchup opened a four-game series at Minute Maid Park on May 11, 2026, with Seattle entering the set holding a perfect 4-0 record in the season series against Houston. Coming into the opener, the Mariners carried a 19-22 overall record and sat third in the AL West, while the Astros struggled to a 16-25 mark, fifth in the division and on a three-game losing streak. Houston posted a 9-10 home record while Seattle managed a weaker 7-11 road mark heading into the series. [ESPN, May 11]
In the series opener on May 11, the Mariners defeated the Astros behind a strong outing from starter George Kirby, who pitched 5.0 innings, allowed 7 hits and 1 earned run while recording 7 strikeouts to improve to 5-2. Julio Rodriguez contributed a solo home run to extend Seattle's lead in the late innings. Seattle entered the matchup favored at -153 odds, with the Mariners listed as -144 moneyline favorites against Houston's +122 in pregame markets. The win moved Seattle to 20-22 and extended Houston's losing streak to three games, dropping the Astros to 16-26. [FOX Sports, May 12]
The Seattle Mariners vs. Houston Astros rematch on May 12, 2026 opened with Seattle listed as -155 favorites and Houston at +128, with an over/under set at 8.5 runs. Yordan Alvarez led Astros hitters with a .318 batting average entering the series, while pitching matchup data showed Kirby (2.94 ERA) and Houston's P. Lambert (2-2, 2.42 ERA) among the listed arms. With the Mariners already 5-0 in the season series following the opener and Houston riding a four-game skid, the remaining two contests of the four-game set will determine whether Seattle completes a sweep or the Astros snap their losing streak at home. [ESPN, May 12]
Polymarket prices this at 64c YES with $243K in volume. Moderate liquidity — use limit orders for positions above $1K to avoid moving the price.
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