Gerrit Cole celebrated his 29th birthday by allowing one hit with 15 strikeouts in a season-high eight innings, and the Astros routed Felix Hernandez and the Mariners 21-1 on Sunday to complete a four-game sweep.

Cole (16-5) won his 12th straight decision and joined Pedro Martinez as the only pitchers in major league history with 14 or more strikeouts in three straight games. Cole leads the major league with a career-high 281 strikeouts, and his 2.73 ERA in second in the AL behind the 2.52 for teammate Justin Verlander.