Roger Federer was fined $3,000 for using an audible obscenity during his Australian Open quarter-final victory over American Tennys Sandgren, tournament organizers said on Wednesday.

The Swiss was handed a code violation for swearing in the third set of Tuesday’s match after the lineswoman reported Federer to Serbian chair umpire Marijana Veljovic.

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Federer clarified in his post-match news conference that he had sworn in a “a mix” of languages and said he was frustrated by the way he received the on-court warning.

Flip the page to see Roger’s sassy response: