The Astros are now two games behind Seattle, which has the tiebreaker, and also fell behind Cleveland in the AL wild-card race.

The Mariners held on for a heart-pounding 6-4 victory, clinching a crucial series win and building on their AL West lead.

The Seattle Mariners turned to right-handed starting pitcher Bryan Woo for their series opener against the Houston Astros on Friday night. These two teams entered the day tied atop the American League West standings with identical 84-69 records.

The Astros now find themselves outside of the playoffs with the loss and the Guardians sweeping a doubleheader.

Christian Walker, in the middle of a rough homestand, was out of the lineup in favor of switch hitter Victor Caratini.

Seattle Mariners right-hander Bryan Woo has been diagnosed with minor inflammation in his pectoral muscle, according to what manager Dan Wilson told reporters ahead of Saturday's game versus the Houston Astros. Woo underwent imaging after departing Friday's start before he could officially begin the bottom of the sixth inning.

The Houston Astros faced a hideous 4-0 loss on Friday night against the Seattle Mariners. For the majority of the season, the Astros (84-70) held onto their division lead in the American League West standings. For quite some time, the Mariners (85-69) trailed closely behind at No. 2. However, with Seattle rising up, the roles have now flipped.