Rafael Nadal is withdrawing from hard-court tournaments in Toronto and Cincinnati because of a right wrist injury, putting his status in doubt for a title defence at the US Open.
Nadal played left-handed, but he used a two-handed backhand.
His manager announced the withdrawals early today.
The Toronto tournament began next week; the Cincinnati tournament started August 11. Those two events would have represented Nadal's hard-court preparation for the US Open, which began August 25.
The Spaniard, currently No 2 in the ATP rankings, won his second championship at Flushing Meadows in 2013. That was part of his collection of 14 Grand Slam titles, tied with Pete Sampras for second in the history of men's tennis, trailing only Roger Federer's record of 17.