Tennis star Roger Federer believes Serena Williams "went too far" in her outburst at umpire Carlos Ramos during September's US Open final.
Williams accused Ramos of being a "thief" and a "liar" during the final against Japan's Naomi Osaka, after receiving a code violation for coaching, then a penalty point for racquet abuse and a game penalty.
The 37-year-old went on to lose the final 6-2 6-4, as Osaka claimed her first Grand Slam, but Williams' outburst overshadowed the occasion.
Williams was then fined US$17,000 (NZ$26,006) for the code violations.
In an interview with the Sunday Times, Federer said the incident could have been handled differently.
"I feel like Serena should have walked away," Federer said. "She did, but she went too far - she should have walked earlier."
Federer admitted that Williams' actions were "a little bit excusable".
"The umpire maybe should not have pushed her there. It's unfortunate, but an incredible case study."
Federer was also asked about the on-court attire of women's players.
France's Alize Cornet received a code violation for changing her shirt on the court during the US Open, while French Open officials told Williams she would be banned from wearing her black catsuit at future events.
"What was the problem with taking the shirt off or the catsuit?" said Federer, a 20-time Grand Slam singles champion.
"Serena has worn crazier stuff in the past. Guys have worn crazier stuff - for me, it was all a bit of nonsense.
"I was totally on the women's side. Leave them alone."
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