Wawrinka hinted that he was getting closer to hanging up his racket after being forced to retire mid-match during his opening round contest at the hardcourt major on Monday against French lucky loser Corentin Moutet. Wawrinka, 37, had twice called the trainer on court to tend to his finger and was trailing 6-4 7-6(7) when he signalled he could no longer continue against Moutet, who managed to make the main draw despite losing in the qualifying stage. It was the sixth straight defeat for the three-time major champion, who lifted his last Grand Slam trophy at Flushing Meadows in 2016.