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Having opened her first Italian Open campaign since 2021 with a straight-sets win over Clara Burel on Wednesday, Osaka produced another slick performance to down the world number 20 one day later.

Osaka blitzed Kostyuk to take the opener in just 36 minutes, taking advantage of a sloppy start from the Ukrainian, who served at just 40 per cent in the first set and tallied 15 unforced errors. 

The former world number one then forced a break within three games in the second set, only for rain to halt proceedings after she went 3-1 up. 

She showed no signs of rustiness upon returning to the court, though, even responding to a late loss of serve with an immediate break back to tee up a third-round clash with 10th seed Daria Kasatkina.