Serena Williams' coach Patrick Mouratoglou says she is feeling fitter than she did before the Australian Open and he still believes she can be a Grand Slam contender.
Williams has a record 23 Grand Slam singles titles in the open era, more than any other player, male or female. She also has an incredible 14 doubles Grand Slam titles too.
She is just one short of the all time record of 24 singles Slams set by Margaret Court, and has previously made it clear that she wants to match, if not, beat that overall record.
Returning to tennis after the birth of her daughter, Williams has come close, reaching four Grand Slam finals and most recently getting to the Australian Open semi-final last month, but has not been able to break that barrier.
Coach Mouratoglou believes she definitely has it in her, perhaps even at the upcoming French Open, but maintaining physical fitness is the key, especially on clay.
"She did a tremendous effort before the Australian Open and was very much in shape so this is something that we definitely want to keep and continue to improve because it's a key, and it's going to be even more a key on clay," said Mouratoglou.
"I think she can really play very good on clay, she just has to be really very fit because on clay the serve is not as efficient and you have to work much more.
"Every rally is a fight. But I feel if she's really, really ready, physically 100 per cent, then she can be very dangerous on clay as well.
"The level is high but I still believe that, when Serena is 100 per cent at the top of her physical form, she can win any Slam."
Of the record that she's been trying to beat since her last Grand Slam win in 2017 at the Australian Open, Mouratoglou admits it's frustratingly close.
"There is clearly a hurdle that we need to pass but she's been close so many times," said Mouratoglou.
For more exclusive content from Tennisbuzz, including news, features, trivia, promotions and more, please be sure to sign up for our newsletter below or via our home page.
Why not test your tennis knowledge by tackling one of our fiendish quizzes too?