Three-time grand slam winner Andy Murray said his singles return may be closer than he originally thought.
The 32-year-old has so far been restricted to doubles action since returning to the game following his hip resurfacing operation in January, winning his first tournament back at Queen's in June before suffering early exits at Eastbourne and Wimbledon.
He will link up with brother Jamie at next week's Citi Open in Washington.
Speaking ahead of the tournament of his return to singles action, he told reporters: "I'm closer than maybe what I thought I was."
Murray added that a return to the hard courts in August was in his sights, and if not, then he would wait until after the US Open.
He said: "Best-case scenario probably would be Cincinnati. And then if I wasn't able to play in Cincinnati, there's a good chance I would probably wait until after New York, because I wouldn't want my first tournament, either, to be playing best-of-five."
Murray's last grand slam appearance was on the hard courts of Melbourne, where he was dispatched in the first round by quarter-finalist Roberto Bautista Agut in four sets.
The Murray brothers last played together at the Rio Olympics, but were a prolific partnership during Great Britain's 2015 Davis Cup victory, while they have won two ATP Tour titles together, in Tokyo in 2011 and Valencia the year before.
Jamie Murray and his Brazilian partner Bruno Soares will finish the year as the world's top-ranked doubles pair.
The duo went into the ATP World Tour Finals trailing Nicolas Mahut and Pierre-Hugues Herbert by 575 points but overhauled them on Thursday courtesy of their third win.
The French duo were eliminated after losing both their first two matches but could still have prolonged the race by winning their final group match against Henri Kontinen and John Peers.
But they lost 6-7 (5/7) 6-4 10-4, meaning Murray and Soares cannot be overtaken.
Murray became the first British player ever to be officially ranked world number one when he moved to the top of the individual doubles rankings earlier this year, pipping brother Andy to the honour.
Soares could now finish the year with that title if he and Murray win the title on Sunday.
Mahut only needed one victory to become the first French player to finish a year ranked number one but the Wimbledon champions have been well below their best at the O2 Arena.
Murray and Soares will play either Feliciano Lopez and Marc Lopez or Raven Klaasen and Rajeev Ram in the semi-finals on Saturday.
Doubles world number one Jamie Murray saw his Wimbledon title hopes shattered after a thrilling five-set quarter-final defeat.
The Scot and Brazilian partner Bruno Soares looked to be heading out in straight sets, but they saved three match points in the third and took it the distance before falling 6-4 6-4 6-7 (11/13) 6-7 (1/7) 10-8 to French opponents Julien Benneteau and Edouard Roger-Vasselin.
A baying Court 18 crowd willed Murray and Soares to come through, and when the third seeds broke back after sliding 4-2 behind in the decider there was renewed hope.
But Murray had his serve broken in the 17th game, and after four hours and 30 minutes of a high-intensity contest, Roger-Vasselin slapped a volley through the British player's defences to secure the win.
Jamie Murray and his Australian partner John Peers have lost the Wimbledon men's doubles final in straight sets.
They were beaten 7-6, 6-4, 6-4 by fourth seeds Jean-Julien Rojer from the Netherlands and Horia Tecau from Romania.
Murray and Peers have earned £170,000 as runners-up.
His brother Andy and sister-in-law Kim stood and applauded from the stands as the pair left the court.
Andy Murray may not have been playing at Wimbledon today but he was cheering on his younger brother Jamie from the sidelines.
Jamie and his Australian partner John Peers were knocked out of the doubles in their opening match losing 3-6,6-3,6-4,3-6,14-12 to James Blake and Jurgen Melzer.
He was then in action again in the evening in a mixed doubles match with his partner Su-Wei Hsieh. Their match has just been suspended due to poor light.