10 things to know for the U.S. Open

NEW YORK (AP) — A look at 10 of the top topics at the U.S. Open, the hard-court Grand Slam tennis tournament that begins Monday and ends Sept. 9:
Associated Press



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LONDON, ENGLAND - JULY 08: Andy Murray of Great Britain reads through the morning papers at Wimbledon on July 8, 2013 in London, England. (Photo by Julian Finney/Getty Images)

PARIS, FRANCE - JUNE 09: Rafael Nadal poses with the Roland Garros Cup At French Open 2013 - Day 15 at Roland Garros on June 9, 2013 in Paris, France. (Photo by Michel Dufour/WireImage)

ULONDON, ENGLAND - JULY 08: Roger Federer of Switzerland celebrates match point during his Gentlemen's Singles final match against Andy Murray of Great Britain on day thirteen of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 8, 2012 in London, England. (Photo by Julian Finney/Getty Images)

BELGRADE, SERBIA - SEPTEMBER 18: Juan Martin Del Potro of Argentina serves to Novak Djokovic of Serbia during the Davis Cup singles semi final between Serbia and Argentina, at Belgrade Arena on September 18, 2011 in Belgrade, Serbia. (Photo by Srdjan Stevanovic/Getty Images)

AFLUSHING, NY - SEPTEMBER 7: Andy Roddick celebrates match point against Juan Carlos Ferrero of Spain during the US Open men's singles final at Arthur Ashe Stadium in the USTA National Tennis Center on September 7, 2003 in Flushing, New York. Roddick defeated Ferrero 6/3, 7/6(2), 6/3.?(Photo by Nick Laham/Getty Images)

OLONDON, ENGLAND - JULY 03: Serena Williams of the USA reacts after winning her Ladies' Singles quarterfinal match against Petra Kvitova of Czech Republic on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 3, 2012 in London, England. (Photo by Clive Brunskill/Getty Images)

!NEW YORK, NY - AUGUST 20: International tennis sensation Maria Sharapova celebrates the one year anniversary of Sugarpova by launching "Sugarpova Accessory Collection" exclusively at Henri Bendel on August 20, 2013 in New York City. (Photo by Craig Barritt/Getty Images for Henri Bendel)

NEW HAVEN, CT - AUGUST 22: Sloane Stephens of the USA returns a shot to Caroline Wozniacki of Denmark during Day Five of the New Haven Open at Yale at the Connecticut Tennis Center on August 22, 2013 in New Haven, Connecticut. (Photo by Elsa/Getty Images)

NEW YORK, NY - SEPTEMBER 10: The sun sets as spectators inside Arthur Ashe Stadium watch the men's singles final match between Andy Murray of Great Britain and Novak Djokovic of Serbia on Day Fifteen of the 2012 US Open at USTA Billie Jean King National Tennis Center on September 10, 2012 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Cameron Spencer/Getty Images)

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