Tomas Berdych has pulled out of this year's US Open as he continues to struggle to overcome a back injury.
The Czech has been hampered by back issues since the end of the 2017 campaign, ending his year early on that occasion following doctors advise.
The 32-year-old had looked strong at the start of 2018, reaching the Australian Open quarter-finals but he has been managing the problem in recent months, only for it to flare up again during his opening round match with Frenchman Julien Benneteau at Queen's Club.
Berdych pulled out of Wimbledon as a result and will skip the entire American hard court season after US Open officials confirmed he had pulled out of the last Grand Slam of the year.
Berdych, whose best performance at Flushing Meadows saw him reach the semi-finals in 2012, has slipped to number 59 in the world as a result of his struggles and is now likely to drop out of the top 100.
Many of the top players have yet to get their first taste of the hard courts following the conclusion of the grass court season, although that will change next week when the Citi Open takes place.
Former US Open champion Andy Murray, Wimbledon finalist Kevin Anderson and last year's winner Alexander Zverev are all scheduled to play in Washington.
The US Open gets underway on 27th August and Novak Djokovic is 5/2 to win back-to-back Grand Slams after his Wimbledon win, while Rafael Nadal is 7/2 to retain his crown.
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