"Depending on what happens in Montreal, I'll take a decision on Cincinnati. Cincinnati is still an option. But I want to arrive well prepared and ready for the US Open, the last major of the season," Nadal stated.
Third seed Zverev will open his campaign against Briton Cameron Norrie or Hungarian Martin Fucsovic. Greek youngster Tsitsipas will face Milos Raonic or Taylor Fritz. The 2018 finalist is on Nadal's half of the draw. Meanwhile, Nick Kyrgios faces Kyle Edmund in the opener.