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Stan Wawrinka

What We Learned at US Open: Djokovic is gaining on Federer

For the second time in his career, Novak Djokovic ends a season with three Grand Slam titles. Unlike in 2011, though, he played in all four major finals this year.

His riveting 6-4, 5-7, 6-4, 6-4 victory over Roger Federer in the U.S. Open final Sunday night left so little between his three titles and a perfect Grand Slam season — a loss to Stan Wawrinka in the French Open final.

On the other hand, unlike Serena Williams, whose pursuit of a calendar-year Grand Slam ended in the semifinals at Flushing Meadows, Djokovic did not have to deal with the mounting pressure of heading to the U.S. Open in search of that rarest of achievements in tennis.

Looking ahead to...