ENLARGE Juan Martín del Potro of Argentina returns a shot to Dominic Thiem of Austria during their fourth-round men's singles matchup at the 2016 U.S. Open. Photo: Al Bello/Getty ImagesJuan Martín del Potro felt bad when his opponent, Dominic Thiem, retired during their fourth-round match at the U.S. Open on Monday. “It’s not good to win a match in this way, I feel very sad for him,” Del Potro said. “I didn’t expect to be in quarters in my second Grand Slam after my comeback,” Del Potro said. Del Potro beat Wawrinka in the second round of Wimbledon this year.

Source: Wall Street Journal September 05, 2016 21:22 UTC