NEW YORK: Swiss superstar Roger Federer was slapped with a 1,500-dollar fine by the United States Tennis Association Thursday for a heat of the battle argument with a US Open official.

Federer used a profanity when talking with the chair umpire during the final in New York on Sunday which he eventually lost to Argentina's Juan Martin Del Potro.

Federer's fine pales in comparison to Serena Williams who was docked 10,000 dollars for threatening to shove a ball down the throat of a female line judge in an expletive-laden tirade in her final singles match.

Williams was also fined 500 dollars for throwing her racquet.

Tournament spokesman Chris Widmaier says there were a total of 31,500 dollars in fines levied at the 2009 US Open.

Vera Zvonareva and Daniel Koellerer were fined the same amount as Federer for swearing.

Canadian doubles player Daniel Nestor was fined 5,000 dollars for unsportsmanlike conduct directed at an unruly fans of his opponent who were cheering double faults.