Serena Williams admits couldn't beat any man in top 100

World No.1 and Wimbledon champion Serena Williams may frighten her female rivals with her all round game, but knows very well that she couldn't stay on the court with any man in the top 100.

Williams made the humble confession after winning her fourth Wimbledon title without dropping a single set, an effort that made her the sixth-most successful women's player in history, the Daily Telegraph reports.

Ever John McEnroe claimed before her final that Williams wouldn't even beat a player inside the men's top 600.

Williams said she'd only stand a chance against "someone who is way outside the top 100" on the ATP Tour.

"I honestly think men's and women's tennis are completely opposite. Men are just stronger than ladies. I even have trouble reading my hitting partner and he is not professional, although he would make a good professional player. It really is comparing apples to oranges," Williams said.

Serena, 28, and sister Venus, 30, were put in their place at the 1998 Australian Open when, as teenagers, they were both thrashed by Germany's world No.203 Karsten Braasch while trying to prove they could take down any man outside the top 200.

Twelve years and 13 major titles later and Serena concedes she still couldn't beat any player to make a men's grand slam main draw.