Serena Williams offered no excuses after suffering a straight-sets defeat to an "unbelievable" Garbine Muguruza in Saturday's French Open final.
Spaniard Muguruza dethroned the world number one to claim her maiden grand-slam victory with a hugely impressive 7-5 6-4 victory on Court Philippe Chatrier.
Williams has failed to add to her remarkable tally of 21 major titles since beating Muguruza at Wimbledon last year and remains tantalisingly close to matching Steffi Graf's Open-era record of 22.
The legendary American was beaten by Angelique Kerber in the final of the Australian Open in January and the defending champion suffered further agony at Roland Garros.
Williams was troubled by an adductor injury in her semi-final win over Kiki Bertens and played four matches in as many days due to the rain in Paris, but the top seed had no complaints after she was beaten at her own game by the powerful 22-year-old.
"I'm not one to ever make excuses and say, like, 'Oh, my adductor was hurting', or whatever. I think at the end of the day I didn't play the game I needed to play to win and she did," said Williams.
"Adductor or not, she played to win. You know, that's what she did."
Williams will go back to the drawing board after she was unable to enter the history books once again, with Wimbledon getting underway in just over three weeks.
Reflecting on her two defeats in major finals this year, she said: "I think in Australia, Ann Kerber made 16 errors in three sets, so what do you do in that situation? Today Garbine played unbelievable.
"The only thing I can do is just keep trying."
Williams added: "It's [her loss to Muguruza] definitely something I want to dissect and see what I can learn from that and what can I do to get better from it.
"That's the only way to keep improving."