NEW YORK CITY, NEW YORK, UNITED STATES (SEPTEMBER 10, 2012) (REUTERS) - Serena Williams credited a more subdued lifestyle on Wednesday (January 2) for the current form which has put her on track to succeed fellow-American Chris Evertas the oldest world number one in women's tennis.
Williams, who recorded a serve of 200 kms an hour during a second-round 6-2 6-2 win over France's Alize Cornet at the Brisbane International in Australia, is currently ranked third in the world.
However, the 31-year-old is regarded as the pre-eminent woman player at the moment after winning the Wimbledon, U.S. and Olympic titles last year, and could become the best in the world given a good run at this month's Australian Open in Melbourne.
Evert was aged 30 years 11 months when she was number one in 1985.
"I'm really boring now," Williams told reporters. "I used to be fun. 'For a fun time, call Serena.' Now for a fun time, do not call me. I don't know what happened to me.
"I think I just got older and I realised I can't be that fun girl for the rest of my life. I think that's pretty much what it is. I could be the oldest number one. I don't know how that goes with the funnest."
Williams said she had not celebrated New Year's eve after a hectic travel schedule had left her body clock in a mess.
"I just don't know anymore. My body is like telling me, 'Don't sleep ever'. I'm nocturnal right now. I can't sleep at night."