Fans along the first few rows of the venue had their smartphones out, appearing to capture the view of the men’s No. 2 seed — with at least one fan with their mouth caught wide open.

Alcaraz had turned heads in the first round when his outfit — a collaboration with Travis Scott’s Cactus Jack Nike brand — allowed his right nipple to get exposed multiple times throughout the match.

He explained that he added an undershirt because “I think I saw my nipple too much lately.”

“I felt like, you know, I could hide it for at least one match,” Alcaraz added.

Alcaraz, the defending champ at the Flushing Meadows Grand Slam, said that having the extra shirt on today wasn’t a bother to him.

“I feel really comfortable, you know, with another shirt. So I think I’m going to stay like that,” he said. “Maybe, you know, the second round was, a little bit distracting for me, but not that much.”

Undershirt or not, Alcaraz has looked true to form in this year’s U.S. Open, having lost just one set through his first three matches.

He’ll face his biggest test of the tournament so far on Sunday when he faces No. 20 seed American Tommy Paul.