Andy Murray has been sidelined from the Montreal Masters this week, and Rafael Nadal can taste number one if he gets to the semis.

"I don't even think about that now," Nadal said of number one. "I'm trying to have the right preparation now and that's it.

"I'm going to keep trying to play the way I did in the first part of the season, so if I'm able to make that happen, I hope to have a chance to do well."

Nadal could also be on track for a third round showdown against 2009 tournament runner-up Juan Martin del Potro who beat hard-serving American John Isner in straight sets 7-5, 7-5 in a night match on Monday.

Murray is among the notable absentees from this key US Open tuneup.

Novak Djokovic is taking off the rest of the season to rehab an elbow injury and US Open champion, Stan Wawrinka has ended his 2017 campaign with a knee problem.

Murray is trying to recover from a nagging hip injury in time for the final Grand Slam of the season that starts later this month in Flushing Meadows.

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