Czech tennis player Karolina Muchova was shaken and paused mid-serve during her second-round match against Romania's Sorana Cirstea at the US Open. "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 at first, but later he did go," said Muchova in the Post-Match Conference.