Andy Murray won his first singles match since Wimbledon when he defeated American Brandon Nakashima in straight sets at the Citi Open in Washington.
The 36-year-old lost in Wimbledon's second round to Stefanos Tsitsipas last month but returned to winning ways with a 7-6 6-4 victory against Nakashima.
The British player will now face the winner of Taylor Fritz's match against Zachary Svajda in the last 16.
"I thought I did well, I hit the ball well from the beginning," he said.
"I was struggling a little bit on the return. Brandon serves well, especially his second serve.