For the third time in the past three seasons, Stan Wawrinka has done the toughest thing in tennis: stop Novak Djokovic in a Grand Slam tournament.
The latest victory, on Sunday, came in the final of the United States Open, with Wawrinka’s 6-7 (1), 6-4, 7-5, 6-3 triumph that gave him a third major singles title at age 31.