The Athletics pitch a one-hitter against the Angels, but still lose, 2 – 0, as the only safety is a two-run homer by Kole Calhoun in the 3rd against Jesse Chavez. Chavez goes 6 innings in his first start of the season, but Nick Tropeano keeps the A’s off the scoreboard into the 7th inning before three relievers complete the shutout.

On April 23, 2015 — The Athletics pitch a one-hitter against the Angels, but still lose, 2 – 0, as the only safety is a two-run homer by Kole Calhoun in the 3rd against Jesse Chavez. Chavez goes 6 innings in his first start of the season, but Nick Tropeano keeps the A’s off the scoreboard into the 7th inning before three relievers complete the shutout.

Source
Baseball Reference April 23