Germany's world number two Alexander Zverev says he is facing a battle to be fit for the US Open following surgery on torn ankle ligaments at the French Open.
Zverev only returned to the practice court last Sunday after the injury he suffered during his semi-final against Rafael Nadal at Roland Garros in June.
Speaking in Hamburg at a press conference on Thursday the Tokyo Olympic champion Zverev said: "Obviously I am going to try to make it to the US Open even if it's in a very very short time."
The last Grand Slam of the season starts in New York in a little over a fortnight on August 29.
If Flushing Meadows comes too soon Zverev is aiming to return for the September 13-18 Davis Cup group phase against France, Belgium and Australia in his native Hamburg.
Nadal at Cincinnati
Rafael Nadal boosted his hopes of competing at the US Open on Wednesday by announcing he will play in next week's Cincinnati Masters.
"Very happy to play again in Cincy. Flying there tomorrow," the 36-year-old wrote on Instagram.
World number three Nadal has not played since suffering an abdominal tear at Wimbledon last month which forced him to withdraw from his semi-final against Nick Kyrgios.
The Spaniard hasn't played in Cincinnati, where he was champion in 2013, for five years.