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Roger Federer and Juan Martin del Potro fought and fought and fought all the way into the record books. But only the Swiss has a chance for gold.

Is Roger Federer out of gas as the tour rolls into London for the year-ending ATP World Tour Finals? And if Fed can't get stoked to secure the No. 1 ranking, who might burst through the door he leaves open?

They say you gain wisdom from experience. Juan Martin del Potro has neither, but it didn't matter in the U.S. Open final.

Fernando Gonzalez is more than a blistering forehand. But does he have enough to upset Rafael Nadal in the U.S. Open quarterfinals?