Rookie lefthander Brett Oberholtzer sidled up to teammate Jose Altuve in the eighth inning of Sunday’s Mariners-Astros matinee at Minute Maid Park and said, “Just get me one.” In most cases this season, just one has been one more than the Astros could manage. But with Oberholtzer in the midst of the Astros’ best pitching performance of 2013, Altuve and catcher Jason Castro came through as requested. The result — back-to-back, eighth-inning doubles for the game’s first run — was what it took to boost Olberholtzer and the Astros to a 2-0 win over Seattle, salvaging the final game of a four-game series before 17,203. Olberholtzer (4-1) held Seattle to [...]