Conor Niland

Novak Djokovic of Serbia returns a shot against Conor Niland of Ireland during Day Two of the 2011 US Open at the USTA Billie Jean King National Tennis Center on August 30, 2011. (Photo by Matthew Stockman/Getty Images)

Top-Seeded Djokovic Advances To US Open 2nd Round

Top-seeded Novak Djokovic showed no signs of any trouble with his right shoulder Tuesday, building a 6-0, 5-1 lead in the first round of the U.S. Open before his ailing opponent stopped playing.