Nadal pulls out of Montreal ahead of US Open
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World number three Rafael Nadal, who has not played since suffering an abdominal tear at Wimbledon last month, has withdrawn from next week's ATP event in Montreal, he said on Twitter on Friday.
The announcement marks a major blow to the Spaniard's hopes of being fully fit for the US Open which begins in New York at the end of the month.
"Since my return to training, everything has gone well these weeks. Four days ago I started work on my service and yesterday, after training, I had a little discomfort that was still there today," Nadal tweeted in Spanish.
"We have decided not to travel to Montreal and continue with the training sessions without forcing ourselves.
"I have no choice but to be prudent at this point and think about my health."
The 36-year-old, who is a five-time winner in Montreal, has not played since pulling out of his Wimbledon semi-final with Nick Kyrgios after failing to recover from an abdominal tear he suffered in the quarters.
It was the latest in a lengthy series of injuries for Nadal who, in the absence of Novak Djokovic at Flushing Meadows, will be looking to add to his record 22 Grand Slam titles
Before his latest setback, he had already missed 11 Grand Slam events stretching back to his debut in 2003.
He has also pulled out during a Slam five times with injuries.
Nadal won the first two majors of the year, the Australian and French Opens, and was on course to challenge to be the first man to win the Grand Slam -- all four majors in one year -- since Rod Laver in 1969.