Andy Murray won his first singles match since Wimbledon by beating American Brandon Nakashima 7-6 (7-5) 6-4 in the Citi Open second round.
The 36-year-old Briton, who lost to Stefanos Tsitsipas in the second round at Wimbledon last month, received a first-round bye in Washington.
Murray, 36, will play Taylor Fritz, who beat fellow American Zachary Svajda 6-3 6-3, in the last 16 on Thursday.
"I did well. I hit the ball well from the beginning," said Scot Murray.
"Brandon serves well, especially his second serve. I was struggling to create many opportunities on return.