Andy Murray pulled out of the Cincinnati Open late Monday with an abdominal strain.
The 36-year-old continues to recover from the injury as he prepares to compete in the US Open that begins later this month in New York. Cincinnati is among some of the tournaments that players view as tune-ups for the Open.
Murray withdrew from last week's Canadian Open before his round-of-16 clash with eventual champion Jannik Sinner due to the strain. He first felt the injury after spending nearly five hours on court in wins over Lorenzo Sonego and Max Purcell.
Andy Murray said at the time: "I had a very similar issue last year in the tournament in Stuttgart before Wimbledon which forced me to miss the Queen's Club tournament and I was able to play Wimbledon. It took me about 10 to 12 days before I was feeling good again.
"This is not as bad as that, but obviously the danger if you compete and play on it is you make it worse. So, I'll need to see how it develops over the coming days and hopefully feel better in a few days. I'm really sorry. Thank you
Karen Khachanov but he will now be replaced by a lucky loser, men’s tennis governing body ATP said.
Murray is currently number 36 in the world - his highest ranking since hip resurfacing surgery in 2019 - and was named in Britain’s Davis Cup team for its Finals group stage ties that will take place after the August 28-September 10 US Open. 
Murray may have fancied his chances of taking an impressive scalp in Khachanov, who has been out of action since losing to Novak Djokovic at the French Open back in June due to a groin injury.
Having won the title in Cincinnati twice before, Murray would have loved a deep run to build confidence ahead of the US Open. The veteran's recent assessment of his abdominal issue suggests that he has not given up hope of a strong showing in New York.
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