Using data from Retrosheet
, I attempted to calculate, for every game between 2000 and 2014, the number of consecutive outs each of the two starting pitchers has recorded before allowing his first man on base. (Data isn’t yet available for 2015.) The code
, which is open-source on Github, correctly identifies the seven perfect games
of the 21st century and the four games spoiled by the last batter
. It turns out that even a perfect game through four innings is fairly rare, having happened 215 times since 2000, not including the current season. Between 2000 and 2014, 0.29% of games featured a pitcher whose thrown four or more perfect innings.