On February 13, 2013, Hernández signed a seven-year extension with the Mariners worth $175 million, voiding the final two years of his previous deal and including a team option for 2020. The contract made him the highest paid pitcher in Major League history, until he was surpassed by the $180 million extension signed by Justin Verlander of the Detroit Tigers in March 2013. On April 22 in a 7–1 win against the Houston Astros, Hernández recorded his 100th career win. In that game Hernández pitched six innings allowed five hits, walked one and struck out nine. On July 6, 2013, Hernández was selected to his fourth All-star game. He pitched in the fourth inning, and let up one hit, but no runs were scored. Hernández had a bad August, going 1–4 with a 5.82 ERA and a .281 OBA. He made only 3 starts in September while trying to rest his oblique. In 31 starts in 2013, Hernández went 12–10 with a 3.04 ERA and 22 quality starts, striking out 216 in innings. He was 5th in the American League in strikeouts, and 6th in ERA.