Serena Williams isn't the only Grand Slam champion using profanity at the US Open: Roger Federer let an expletive fly, too. 
 In an uncharacteristic display, Federer argued with chair umpire Jake Garner during a changeover in the US Open final yesterday. 
 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." 
 On-court microphones picked up the exchange during its live television broadcast of the match.

Serena Williams isn't the only Grand Slam champion using profanity at the US Open: Roger Federer let an expletive fly, too. 

Federer abuses during US Open final

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Federer abuses during US Open final

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