Serena Williams matches up against any tennis player

Serena Williams of the U.S. center watches her sister Venus Williams' match against Japan's Kurumi Nara during their second round match of the French Open tennis tournament at the Roland Garros stadium in Paris France. Wednesday

Williams told Vanity Fair she found out she was pregnant about a week before winning her record 23rd Grand Slam tournament singles title at the Australian Open in January. Isn't she the greatest tennis player that ever lived?' And I just said, wait, hang on a second here, if we're gonna talk about that, then you get into a little different category.

On Tuesday's Late Show, McEnroe was pushed to clarify his comments by host Stephen Colbert.

"Why don't you combine ..."

The man ranked 701 in the world says he'd also be confident of beating Serena Williams. Am I having a baby?

Don't believe it? According to Vanity Fair, the week before the Australian Open, Williams was concerned about missing too many backhands, so she hit 2,500 of them over the course of almost three hours and if she missed one, she started over.

"I felt like a door had been opened to a person who made me want to be my best self", said Alexis.

"I think she's doing it tongue in cheek as well and I think deep down we're talking about something..."

"That doesn't mean I don't think Serena is an incredible player", he said. "I've said this 1000 times", McEnroe said. "She's certainly one of the greatest athletes of the last 100 years", his guest said, but he ultimately stands by his opinion.

Ace tennis player Serena Williams, who is now six months pregnant with her first child, flaunted her baby bump for the latest cover story of Vanity Fair magazine. She took five more tests - all positive.

He simply states that Williams is the best female tennis player and should be respected as such.

"Dear John, I adore and respect you but please please keep me out of your statements that are not factually based", she wrote.

The 35-year-old tennis champion was shot by celebrity photographer Annie Leibovitz for the front cover of Vanity Fair posing sideways on with nothing but a skin-coloured thong, covering her breasts with one hand and resting her other on her back, her six-month pregnant belly thrust out.

"I would hope that I would win against Serena". Then he became the second man to drag her pregnancy into a conversation Williams said she wanted no part of.

McEnroe re-ranked his top players, placing Roger Federer at No. 1 and Williams at No. 5. "This is happening sooner than later, and it's going by so fast".