WTA chief defends ranking system

WTA chief defends ranking system

The 20-year-old will become Denmark's first world number one on Monday after winning five titles this year -- toppling 13-times grand slam champion Serena Williams who will make her comeback in Austria next week after a long injury lay-off.

"I think Caroline is an incredibly exciting young athlete," Allaster said. "The ranking system rewards athletes for 12 months of consistent performance. She has earned it, she has won more matches than anyone else and it's incredibly exciting to have her as our future and world number one.

"The debate will go on forever. But she deserves the acclaim and in my book is a very worthy number one. There are many milestones in an athlete's career and that fact she has achieve this at 20 is an incredible achievement."

Williams has not played a competitive match since winning Wimbledon in July, undergoing surgery after badly cutting her foot on broken glass at a restaurant.

She pulled out of last week's Tokyo hardcourt event and this week's Beijing tournament but Allaster is looking forward to the American's return.  "It's exciting to have Serena back on the court.