The U.S. Open is set to begin Monday at the USTA Billie Jean King National Tennis Center in Flushing, Queens and will draw more than 700,000 fans over the ensuing two weeks. Here are five key questions as the last Grand Slam event of 2011 unfolds:
**Can Djokovic keep making history?
No. 1 seed Novak Djokovic is having one of the greatest single seasons in the history of tennis. He is 57-2 in 2011 and has won nine tournaments, including the Australian Open and Wimbledon. Still, the 24-year-old Serb withdrew last Sunday against Andy Murray in the final in Cincinnati, citing shoulder problems.
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