Jessica Pegula and Jack Draper were on the brink of reaching the final of the US Open Mixed Doubles Championship before a sensational collapse, and the women’s tennis star appeared to swear when apologizing to her partner.

Pegula and Draper lost to Iga Swiatek and Casper Ruud in the semifinal on Wednesday, despite having a four-point lead in the decisive tiebreak. The match was tied after two sets, forcing a winner-takes-all tiebreak in the revamped mixed doubles format.

Down 8-4 in a race to 10 points, Swiatek and Ruud won six-straight points to claim an unlikely win and reach the final. Pegula was desperate to win the championship and told Draper off for calling it an “exhibition” earlier in the tournament, but apologized after losing the semifinal.

Pegula was depleted after losing the match and turned to Draper as they came to terms with the crushing defeat. Pegula appeared to say, “F—, I’m sorry,” as Draper consoled her after the loss.

The result put Swiatek and Ruud in the final, where the winning duo will receive $1 million. Pegula and Draper entered the 16-team field as the No. 1 seeds, but will now turn their attention to the singles draw next week.

Swiatek and Ruud’s impressive comeback was unexpected. However, Ruud praised Swiatek’s attitude after reaching the semifinal, and she executed another stunning performance.

“Just the grit and determination,” Ruud said when asked about Swiatek’s main strengths. “She’s a very kind human, as I see her from the outside, I get to know her a little bit more. She wants the best for everyone around her.

“I really like when she does her swings on the court and gets ready for a point. It’s not something the men always do too much. I really think it’s a cool thing. It’s her thing, way of getting ready for a new point.

DON’T MISS

“I’ve done it in the past in training. I don’t do it so much in matches. It just shows how focused and determined she is.”

Pegula and Draper’s chemistry has grown throughout the competition, but they had only met four times before being paired. Pegula was initially meant to play alongside Tommy Paul until Draper became her new partner.

“I feel like you’re a way better doubles player than I thought. I don’t know how much you played doubles,” Pegula said about Draper earlier in the competition.

“But he’s, like, calling things, wants to be super aggressive in formations and stuff like that. That was great. I feel like, yeah, I wasn’t expecting that. I felt like once we got that going, it seemed like it was going to be a better partnership than maybe I even thought.

“I didn’t really know what to expect. It’s been, yeah, a lot of fun. I like learning how people think, too, just the decisions that we make, kind of what’s going on in his head, stuff like that.”