Novak Djokovic and Rafael Nadal lost to Canadian wildcards on doubles debut . It is first time in 34 years that top two players in men 's doubles have formed a pair . Murray and Bryan will begin qualifying for U.S. Open at end of August .
Novak Djokovic and Rafael Nadal lose to Canadian wildcards on doubles debut . It is first time in 34 years that top two players in men 's rankings have formed a pair . Nadal and Djokovic will continue preparations for U.S. Open at end of August .