Mariners 7, Astros 1
HOUSTON — Top prospect Taijuan Walker did not allow an earned run over five innings in his major-league debut and Dustin Ackley had a career-high four hits with four RBIs for the Mariners. Walker, 21, retired the first eight he faced and left having yielded two hits and one run. The Astros were up by one in the fourth when Ackley tied it with an RBI single. Seattle led by two in the fifth before a single by Ackley made it 5-1. He had an RBI single in the ninth.