Chicago White Sox starter Philip Humber has thrown the 21st perfect game in MLB history.

This perfecto was the first this year and is part of a recent trend of no-hitters. Humber retired all 27 Seattle Mariners batters in a 4-0 win.

Humber threw just 96 pitches, 67 of them for strikes. He struck out nine batters. His final strikeout came on a controversial call that ended the game. Mariners pinch hitter Brendan Ryan worked the count to 3-2, and he fouled off a pitch. On the seventh pitch of the at bat, Ryan took a check-swing, and the umpire called him out. Catcher A.J. Pierzynski dropped the ball, but Ryan argued the call, and Pierzynski threw the ball down the first base for the final out of the game.

The last pitcher to throw a perfect game was Roy Halladay on May 29, 2010. Halladay accomplished his perfect game against the then-Florida Marlins. Mark Buehrle of the White Sox tossed a perfect game in July of 2009.

Humber’s feat marked the first time that he went the distance in any major league game. His previous high was 7.2 innings. In April of 2011, Humber had a no-hit bid through 6.1 innings against the New York Yankees.

Humber has dealt with some injuries since being drafted third overall by the New York Mets in 2004. His most significant injury to date was when he required Tommy John surgery in 2005.

Humber was picked up by the White Sox in January of 2011, and the White Sox have  been waiting for Humber to finally play to his potential. This game may end up being the breakout game in this young pitcher’s career.