It seems the women's semi-final at the US Open won't be the only high-profile match marred by a profane outburst. Although it appears that it was not nearly as intense (and critically important to the match) as what happened to Serena Williams, Roger Federer cursed at the chair umpire after he disagreed with his opponent, Juan Martin del Potro, being allowed to challenge a call after a lengthy period of time.
Federer began complaining to the chair umpire that del Potro should not be allowed to challenge a line call so long after the point had ended: "I wasn't allowed to challenge after two seconds. The guy takes like 10 every time." The umpire told Federer to be quiet, and this did not sit well with the tennis champion: "You have any rules? Don't tell me to be quiet, ok? When I want to talk I'll talk, all right...I don't give a shit what he said, ok?"