Like her timing on the court, tennis icon Martina Navratilova was on the mark again.

After the first semifinal match between Novak Djokovic and Kei Nishikori ended, the 57-year-old Navratilova, an 18-time Grand Slam champion, got down on one knee and proposed to girlfriend Julia Lemigova.

It was all captured on the big screen at Arthur Ashe Stadium, and when the former Russian model said yes, a delighted crowd cheered.