The fourth-round singles matches at the U.S. Open were underway Sunday, and Mardy Fish, the Davis Cup captain and former tennis star, was remembering the moment nine years ago in New York when he sat in the car sobbing with his wife, Stacey, and decided, with her help, that he could not play in the fourth round against Roger Federer.

"It was just crazy anxiety, crazy, crazy, just how am I going to walk out on this court?” he said by telephone from his home in Los Angeles. "But it never, never would have crossed my mind, if my wife wasn’t there with me, that I wouldn’t play. We’re so trained to never show weakness, never show fear, to the other side of the court. But my wife saying, ‘Well, you don’t have to play’ — that part right there was like, right away, just instantly, I felt better, like a weight was lifted off my shoulders.”

Fish is now 39, a parent with Stacey of two young children. He works in finance and is still involved in professional tennis as the U.S. Davis Cup captain. But he is also a mentor, sharing his experience as a prominent athlete who had to deal with mental health problems when the subject was close to taboo in pro sports.