Top seed Alexander Zverev switched into survival mode to claim a milestone 500th ATP match win on Thursday, fighting back to beat Matteo Arnaldi 6-7 (5/7), 6-3, 6-2 at the Toronto Masters. Germany’s Zverev broke twice in the deciding third set to reach the fourth round of the US Open tuneup, converting his second match point to back up his defeat of the Italian earlier this year in Acapulco. 

“It’s a great achievement. Not a lot of player reach this milestone. But I still want 500 more,” Zverev, winner of 24 ATP titles, said.

The German World No. 3 will face Argentina’s Francisco Cerundolo for a place in the last eight.