Defending champion Jannik Sinner showed no signs of rust after a one-month break as he cruised past Colombian qualifier Daniel Galan 6-1 6-1 in the Cincinnati Open second round on Saturday, while third seed Iga Swiatek thumped Anastasia Potapova 6-1 6-4.

World number one Sinner opted to take some time off after his Wimbledon win but was in pristine form at the ATP 1000 event after a first-round bye, producing just four unforced errors.

He will next play Canadian Gabriel Diallo.

"It's very difficult to play here, I feel like the ball is flying, it's very fast," the Italian told Tennis Channel after closing out the match in 59 minutes.

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