Britain's Andy Murray said he felt "physically good" after his opening-round win in the Western & Southern Open at Flushing Meadows.
Murray beat American Frances Tiafoe 7-6 (8-6) 3-6 6-1 in his first ATP Tour match of the year.
The two-time champion will next face German fifth seed Alexander Zverev at the warm-up for the US Open at the same New York venue from 31 August.
"Physically, I thought I did pretty well," said Murray.
"I moved maybe better than I expected to. The first few matches back, when I started playing singles last year, I moved way worse than I did here, so that was positive.