Roger Federer’s choice of words during the United States Open final will cost him $1,500.

That’s decidedly less than Serena Williams’s $10,500 outburst during the women’s semifinal, in which she said something threatening — she does not remember what — to a line judge ($10,000) and abused her racket ($500). Williams apologized to fans and said she wanted to give the lineswoman “a big old hug.”

It’s all part of $31,500 in fines meted out to players at the Open, according to a United States Tennis Association spokesman.

The penalty for Federer, one of Switzerland’s 300 wealthiest people, is the same as the fines issued to Vera Zvonareva ($1.4 million in earnings this year) and Daniel Koellerer ($223,707) for using profanity. It represents 0.005 percent of the more than $25.9 million Sports Illustrated estimates Federer made last year in tennis earnings and endorsements.

Federer argued a call with the chair umpire during the final against Juan Martin del Potro, using a profanity that was picked up by the CBS microphones on the court for the live broadcast of the match.