In an uncharacteristic display, Federer argued with chair umpire Jake Garner during a changeover in the U.S. Open final Monday. He said his opponent, Juan Martin del Potro, was given too much time to challenge a line call.
"I wasn't allowed to challenge after 2 seconds. The guy takes, like, 10," Federer said.
Then the 15-time major champion used a profanity in addressing Garner: "Don't tell me to be quiet, OK? When I want to talk, I talk. I don't give a ... what he said."
CBS microphones picked up the exchange during its live broadcast of the match.
"It's regrettable, of course," CBS spokeswoman LeslieAnne Wade said. "But it's a part of the live coverage of sports events."