Chicago White Sox pitcher Phil Humber threw a perfect game against the Seattle Mariners on Saturday afternoon.

Humber dominated the Mariners throughout Saturday, although the last out was a controversial one. On a full count in the bottom of the ninth inning, Humber struck out Brendan Ryan on a checked swing, even though it looked like Ryan might not have swung all the way.

I can't even put it into words, Humber told the announcers after the game. So many good things happening to me right now. [It's] definitely something I'll never forget.

The perfect game was the 20th pitched during the regular season and the 21st thrown in Major League Baseball history -- Don Larsen had one in the 1956 World Series. Humber is the fourth pitcher to throw a perfect game in the last four years. He is also the third White Sox pitcher to toss a perfecto -- the other two being Mark Buehrle in 2009 and Charles Robertson in 1922.