Top seed Jannik Sinner ensured he avoided the same fate as Novak Djokovic and Carlos Alcaraz by steamrolling his way into the fourth round of the US Open.

The Italian saw his closest-ranked rivals - defending champion Djokovic and Spain's Alcaraz - suffer shock defeats at Flushing Meadows earlier this week.

Sinner had no such problems against Christopher O'Connell, beating the Australian 6-1 6-4 6-2 in less than two hours to reach the second week in New York.

"Everything can happen in this sport. I try to stay on my side of the net and try to take it day by day," Sinner said when asked about Djokovic and Alcaraz's early exits.

"There have already been a couple of upsets so let's see what's coming but I'm very happy to still be here."

The 23-year-old will face American home hope Tommy Paul, the 14th seed, or Canada's world number 143 Gabriel Diallo in the last 16.