HOUSTON (AP) — Yordan Alvarez smashed a game-ending, three-run homer with two outs in the ninth inning off Robbie Ray, wrecking Seattle’s strategy of using a Cy Young Award winner in a rare relief role and vaulting the <a href="https://www.fox26houston.com/tag/mlb/astros" target="_blank">Houston Astros</a> over the Mariners 8-7 Tuesday in their playoff opener.Trailing all game after a poor start by Justin Verlander, the AL West champion Astros overtook rookie star Julio Rodríguez and the wild-card Mariners at the end to begin their best-of-five Division Series.<a href="https://www.fox26houston.com/tag/us/tx/houston" target="_blank">Houston</a> was down 7-5 when rookie pinch-hitter David Hensley reached with one out in the ninth as Seattle closer Paul Sewald grazed his jersey with a pitch.<a href="https://www.fox26houston.com/tag/mlb/astros" target="_blank"><strong>LATEST HOUSTON ASTROS NEWS</strong></a>Sewald struck out Jose Altuve before Jeremy Peña laced a single to center field to chase Sewald.Mariners manager Scott Servais then made the bold move to bring in Ray, who started Saturday at Toronto in the AL wild-card series, for a lefty vs. lefty matchup with Alvarez. Ray won the Cy Young last year with Toronto, had made only six relief appearances in his career and had never earned a pro save.Alvarez, who hit 37 homers in the regular season, sent Ray's second pitch deep into the seats in right field to set off a wild celebration with his parents in the stands.<a href="https://www.fox26houston.com/sports" target="_blank"><strong>MORE HOUSTON SPORTS NEWS</strong></a>The Mariners jumped on Verlander for six runs in just four innings to build a 6-2 lead early. Yuli Gurriel hit a solo homer in the Houston fourth before Eugenio Suarez's solo shot in the seventh extended Seattle's lead to 7-3.A two-run homer by Alex Bregman off Andrés Muñoz cut the lead to 7-5 in the eighth inning to set up the dramatic finish.<i>The Associated Press contributed to this report. </i>