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Czech tennis star Karolina Muchova needed to rally against her Romanian opponent, Sorana Cîrstea in the second round of the U.S. Open .

Muchova was down 4-1 in the second set on Thursday when she needed to briefly halt the match. She began to get emotional and admitted after the match it was because she saw her ex-boyfriend sitting in the crowd.

She rallied to defeat Cîrstea in three sets.

"Well… it wasn’t tennis-related," she told reporters after the match, via The Athletic . "So l don’t really like talking about it. But opposite my bench, my ex-boyfriend sat down. He sometimes shows up at places where he shouldn’t be. That startled me a bit. I told him to leave, he didn’t, but later he did go. It was hard to focus i

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