Federer had a rare run-in with the umpire at Flushing Meadows
Roger Federer has been fined $1,500 (£900) for swearing while arguing with the umpire during the US Open final.
Television microphones caught the outburst as Argentina's Juan Martin Del Potro ended the world number one's five-year unbeaten run in New York.
A tournament spokesman said Federer was being docked the same amount as Vera Zvonareva of Russia and Austria's Daniel Koellerer for audible obscenity.
Serena Williams was fined $10,000 (£6,000) for unsportsmanlike conduct.
The American was also fined $500 (£300) for racquet abuse.
Canada's Daniel Nestor was docked $5,000 (£3,000) for unsportsmanlike conduct towards a fan, bringing the grand total for the tournament to $31,500 (£19,000).