On May 29, 2010, Roy Halladay of the Philadelphia Phillies pitched the twentieth perfect game in Major League Baseball history, against the Florida Marlins in Miami. He retired all 27 batters, striking out 11. This was the first time in the modern era that two pitchers (Dallas Braden of the Oakland Athletics being the other) threw perfect games in the same month and that multiple perfect games had been achieved in the same season.