"No. I don't think it is a big thing for tennis, to be honest," she told reporters, when asked whether she had seen any evidence of match-fixing.

"I think we are OK, I don't see it as a problem. I don't think about it per se," added the 27-year-old, ahead of her opening match against Chinese star Peng Shuai in the JB Group Classic.

Rumours of match-fixing and concerns over unusual betting patterns and betting by players have dogged the sport for some time.

On Monday, tennis legend Martina Navratilova backed efforts to rid tennis of corruption but conceded that match-fixing was hard to prove.

Williams, the current Wimbledon champion, added she would be tussling with her sister Serena for the number one spot during 2008.

"I definitely want to return to number one," she said, when asked about her sister's aim to head the rankings this year.

Venus Williams, currently ranked eight in the world, said she would also be focusing on the Beijing Olympics, in an effort to regain both the singles and doubles titles she won in Sydney in 2000.