Quote:

How unlikely was this performance? Dallas Braden, over the course of his career, had allowed 6.9 hits per 27 batters, 2.0 walks per 27 batters, and 0.2 reached on errors per 27 batters. Overall, thats 9.1 runners allowed per 27 batters his numbers for this season alone are similar. According to a basic binomial distribution, the odds of Braden allowing no runners in 27 batters, as he did on Sunday, are .00001517, or 0.001517%. Bradens perfect game wasnt quite one-in-a-million. It was more like 15.2 in a million.




http://www.fangraphs.com/blogs/index.php/perfection-2/
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2013-14 -- One for the other thumb.