Alexander Zverev and Daniil Medvedev both suffered upsets against Dutch opponents in the second round of the Canadian Open, while fellow title contender ​Taylor Fritz also crashed out in Montreal. The defeat comes as a setback to the German’s preparations for ​the US Open, which begins on August 30. “I’ve been very close ⁠to throwing in the towel a couple of times,” world number 69 Griekspoor ​said after claiming his third victory over French Open champion Zverev. Fourth seed Medvedev lost 6-3 7-6(5) to Botic van ​de Zandschulp, who scored his first win over the 2021 US Open champion. World number one Sinner and 24-times Grand ⁠Slam ​champion Novak Djokovic decided to skip the US Open tune-up tournament, while world number two Carlos Alcaraz is nursing a wrist injury that also ruled him ​out of the Cincinnati Open.