The Frenchman believes there are no limits with the victor of 23 majors, who has not contested a rankings match since winning last year's Australian Open.
Serena Williams is gunning for Roland Garros, her coach has warned, as the dominant force in women's tennis over the past decade targets a comeback following the birth of her daughter. His three major triumphs in that time mean he is just the fourth player - and first male - ever to win 20 or more Grand Slams.
Serena Williams will be at "full flight" upon her return to the WTA Tour and it would not be a surprise to see her winning top titles immediately, says Martina Navratilova.
"They hung around and did wonderful for the game and I'm just really happy for them, to be quite honest". The ad features footage of Williams throughout her career as she voices over an account of all the ways she's been criticized for not being womanly enough before saying "b$3 ut I'm proving time and time again that there's no wrong way to be a woman".
'I think everyone should have high expectations. She doesn't just want to show up and give somebody a leg up so they can say "oh I beat Serena".
Her sister Venus, who was also at the event in NY, said: 'I mean, the matches are definitely a good way to know where you are, but obviously she knows how to play. "I hope that is the result, that this is a lot of excitement and more people start playing".
'She's going to bring that instinct on the court with her, so I don't think she's too anxious about that'.
The American is due to compete at Indian Wells where she takes on Zarina Diyas of Kazakhstan, ranked 53 in the world, on Thursday.
The increasingly selective Swiss may now fancy his chances of winning a second successive Sunshine Double amid an increasingly depleted field on the hard courts of Indian Wells and Miami over the coming weeks having rejected a wild card invitation from the Dubai Duty Free Tennis Championships.
"I do feel she is the same person once she steps on a tennis court". However, she asserts that she is committed to bounce back to the apex of her performance, in a matter of time.
This moment for Williams is one she never expected.