U.S. men's struggles create vicious cycle; more mailbag

No. 26 Sam Querrey (pictured) and John Isner are the only American men ranked in the top 75.

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2. As usual, a rash of withdrawals has hit the Rogers Cup. To some extent, this is an unfortunate consequence of the Slams raising prize money. As the prize money differential between the majors and the other tournaments becomes a gaping chasm, you have to think that players have less incentive to risk injury (and intensify fatigue) playing other tour events, even if, technically, they are mandatory.

Samantha Stosur won the Southern California Open last week for her fourth career title.

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• John Y. of San Francisco has long-lost siblings: In honor of Martina Hingis' return to the tour, Hingis and actress Natalie Portman.