OAKLAND -- Yonder Alonso notched his first homer of the season in thrilling fashion, launching a walk-off, three-run homer off Pat Neshek in the ninth inning for the A's, who also watched their top pitching prospect, Sean Manaea, make his big league debut in the 7-4 series-opening victory over the Astros at the Coliseum on Friday evening.
The A's trailed by two heading into the eighth inning but tied the game with right-hander Ken Giles on the mound thanks to a solo homer from Marcus Semien -- his team-leading sixth of the season -- and a sacrifice fly off the bat of Jed Lowrie after Billy Burns singled, stole second and advanced to third on an error.