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SF Giant Matt Cain is No. 1 in this week's Cross-Sport Power Rankings by pitching the first perfect game in the 130-year history of the Giants. LeBron James is runner-up and Webb Simpson's U.S. Open win gains the third spot.

The votes are in, and our CSPR winner this week is Serena Williams, queen of the court for her U.S. Open win; Robert Griffin III, who played a faultless game in beating the Saints, is our runner-up, and Andy Murray is third for winning his first majo