Rafael Nadal was pumped and so was Tiger Woods. Let the fist pumping begin.

The golf great, along with his kids and girlfriend Erica Herman, watched Nadal’s 6-3, 3-6, 1-6 fourth-round win over Marin Cilic in the fourth round of the U.S. Open from a private box at Arthur Ashe Stadium on Monday night. At one point the 18-time major champion triggered a roar and signature fist pump from Woods.

“What a great night watching @RafaelNadal.,” Woods tweeted after the win. “Just an incredible performance and awesome way to close out the match.”

His fist pump came after a nine-shot volley that Nadal won with a strong forehand shot from the back line to put himself up 40-love while leading 2-1 in the third. He let out a yell and fist pump and Woods followed suit.

“I always say that I’ve never had big idols, but if I have to say one idol it’s him,” Nadal said in his on-court interview.