Novak Djokovic will be defending his U.S. Open title in Flushing Meadows as he bids for his second grand slam of the 2012 season.Getty Images
Former world No. 1 Jim Courier, now captain of the American Davis Cup team, won four grand slam titles but missed out at his home event -- losing the 1991 U.S. Open final to Stefan Edberg.AFP/Getty Images
Courier told CNN that Andy Murray is now one of the "big four" after beating Wimbledon champion Roger Federer in the Olympics final at London 2012, while bronze medalist and 2009 U.S. Open champion Juan Martin Del Potro is an outside threat.Getty Images
Courier said Wimbledon and Olympic champion Serena Williams is a clear favorite to win her fourth U.S. Open title and first since 2008.