World number one Jannik Sinner dropped only four games in a dominant straight-set win over Vit Kopriva in the first round of the US Open.

The defending champion wrapped up a 6-1 6-1 6-2 victory over Czech player Kopriva, ranked 89th in the world, in an hour and 38 minutes on Arthur Ashe Stadium.

Most notably, the 24-year-old Italian showed little sign of the illness which forced him to retire early from his Cincinnati Open final against Carlos Alcaraz last week.

“I’m very happy that I’m healthy again and that we did our best to be in the best possible shape here,” Sinner said after his win.

Kopriva, making his main-draw debut in New York, failed to pose any serious threat to Sinner, who has now won 22 consecutive matches at hard-court Grand Slams.