Andy Murray returns to DC tournament for 1st time since 2006

In doubles, the second stop on Mardy Fish's farewell tour began with a victory. Fish, who plans to retire after the US Open, teamed with Grigor Dimitrov to beat last year's Wimbledon champions, Jack Sock and Vasek Pospisil.

Murray's season so far: three titles and a 48-7 record.

"The year as a whole, obviously, has been good. It's been much, much better than last year. So there's been some progress there," Murray said. "But obviously I want to keep trying to do better, and hopefully these next few weeks, I can go on a good run on hard courts and finish the year strong."

At the majors, Murray reached one final (losing to Djokovic at the Australian Open) and a pair of semifinals (losing to Djokovic again at the French Open).

"In terms of goals, one of the things I spoke about at the beginning of the year was consistency, and trying to make sure I did better at more of the events than I had done in the past. And I feel like that's obviously been a positive," Murray said.

"The Grand Slams are tournaments I want to win. Haven't quite managed to do that yet this year, but I feel like I've played well in all of the Slams. The French Open was the best I've ever played on the clay. The Australian Open, I was very close there, I felt. And unfortunately at Wimbledon, Roger played an unbelievable match. He served extremely well there and was just too good on that day."