The 20-time Grand Slam winner defended his outburst but accepted the punishment which came with it.
“I mean, I don’t know. I understand,” Federer said. “Back in the day I feel like we could speak to lines-people. Nowadays they tell me, ‘Go speak to the umpire’.
“Okay, I’ll go speak to the umpire. I walk across the court because they are not allowed to speak to the players.
“Honestly, to be frustrated at one point for over, I don’t know, 15 hours [sic] throughout the match, I think it’s normal.
“I found it a bit tough. It’s not like I’m known to throw around words and whatever. It’s not like the whole stadium heard it either. But no problem, I’ll accept it.”
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source: express.co.uk