Super-cool Serena is an inspiration to herself

It is unlikely that Serena Williams has ever been described as bashful.

When the 11-times grand slam champion was asked to take a look back at her US Open career on Monday, she said her younger self would find the 2009 version of Serena as "super cool".

The world number two opened the defence of her title at Flushing Meadows with an easy 6-4 6-1 victory over another American, Alexa Glatch, on Monday and then quickly turned her thoughts to her memoir "On the line".

Williams said she wrote the book to help motivate people and inspire them to make the best of themselves and was asked what the ten-year-old Serena would think of the 27-year-old incarnation.

"I think that I would just think that this Serena Williams today is super cool - I would love to get her autograph," she said.

"I think she would have been my idol because growing up there weren't too many black people. I loved Zina Garrison and Lori McNeil. I would have had a little favouritism toward myself and Venus (Williams)."

The Wimbledon and Australian Open champion said the way the Williams sisters overcame childhood struggles to each become world number one should provide others with the inspiration to achieve their dreams.

"That's another reason I wrote it because I felt that what makes a champion isn't how well they do," she said. "It's about how well they can recover when they fall, or if they fall."

Serena slipped outside the top 100 in 2006 after a series of injuries, only to bounce back by winning the Australian Open in January 2007.

"I love Muhammad Ali, he went to jail for a period of time and he came back on top of the world," she said.

"I just thought (about) what it would be like. I was on top of the world and then things came crashing down. You get to see people who are really your friends and you get to see people that really stick by your side and how you can recover from that and stay strong.

"I just think anyone can do it. You just have to have a kind of guide sometimes to get there."