WATCH—Andy Murray wins a three-hour match at 3 a.m. in Washington, D.C.:

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Andy Murray is unsure about his ability to play best-of-five matches at this point in his comeback, though he plans to compete at the US Open.

"I kind of need to see once I'm in that position," he told press at Cincinnati. "I have played four, you know, three-set matches and a couple long ones in Washington."

Murray returned during the grass-court season from hip surgery, but chose not to play Wimbledon. He began the hardcourt season with two matches at Washington, withdrawing from the tournament following a 3 a.m. finish, and then fell in the first round of Cincinnati.

He hopes to have improved further before Flushing Meadows.

"Hopefully, with another couple of weeks and training...and I can keep working on things," he said. ''It's just going to take a bit of time, you know, and I need sort of that consistency on the tennis court. Right now I'm having to balance—you know, the weeks when I'm off playing I'm still spending 70, 80 percent of my time working on the physical side and the rehab and a lot less on the tennis."

The three-time Grand Slam champion has been far from his best since returning, but noted he has still taken two Top 20 players—Lucas Pouille, Nick Kyrgios—to three sets.

"So there has been some positives there," said Murray. "And if I can improve by kind of 10, 15 percent, you know, you turn a lot of those matches around."