On August 15, Hernández threw the first perfect game in Mariners history and the 23rd and most recent perfect game in MLB history. He recorded 12 strikeouts, five of which were in the last two innings, against the Tampa Bay Rays in a 1–0 victory. It was the fourth no-hitter in team history and Hernández joined Randy Johnson and Chris Bosio as the only Mariners pitchers to throw individual no-hitters. One of their no-hitters were combined, needing six pitchers to do so on June 8 against the Dodgers. His perfect game was the last no-hitter thrown in the American League for the next three years, until his Japanese teammate, Hisashi Iwakuma succeeded him on August 12, 2015.