Nick Kyrgios’ latest U.S. Open win had girlfriend Costeen Hatzi on the edge of her seat.

One day after the 27-year-old Australian athlete defeated the reigning champion, Daniil Medvedev of Russia, Hatzi quipped in an Instagram Story that she craved a certain beverage afterward.

“A cocktail was needed after the stress of the match lol,” the social media influencer, 22, captioned a video, in which she’s seen carrying a drink.

Hatzi had a front-row seat Sunday to Kyrgios’ thrilling victory over the No. 1 seeded Medvedev, in which he bested last year’s U.S. Open winner, 7-6 (13-11), 3-6, 6-3, 6-2. Kyrgios will now face Russian Karen Khachanov in the quarterfinals at Arthur Ashe Stadium on Tuesday night.

“I hadn’t won a match on Ashe before this week, now I’ve won two against two quality opponents,” Kyrgios said Sunday. “I feel like I’ve been able to showcase [my ability]. There’s a lot of celebrities here, a lot of important people here watching. I wanted to get on that court and show them I am able to put my head down and play and win these big matches.”

Kyrgios, whose on-court theatrics were once again on full display, also praised Hatzi for her support.

“I’ve got a great girlfriend, she helps me … and my team,” he said. “I’m just really happy and hopefully I can keep it going. I’m just working really hard.”

Kyrgios and Hatzi went public with their romance late last year following his breakup with Chiara Passari. He has been accused of assaulting Passari stemming from a 2021 incident.