Wawrinka wins but still has work to do
Former US Open champion Stan Wawrinka, who skipped the US Open, won the second-tier Challenger tournament in Prague on Saturday, defeating Aslan Karatsev of Russia
Wawrinka latest to withdraw from US Open
Former US Open champion Stan Wawrinka has become the latest player to miss the New York Grand Slam, announcing his decision on Friday. Wawrinka cited