US Open top seed Jannik Sinner makes short work of Christopher O’Connell

World number one Jannik Sinner secured his place in the second week of the US Open by overcoming Christopher O’Connell in straight sets. Sinner, the last top-three seed standing, hit 15 aces and 46 winners without facing a break point. His next opponent will be either Gabriel Diallo or Tommy Paul in the fourth round.