"I believe Li Na is a maverick who has been carrying Billie Jean King's legacy in China for today's generation. She wasn't afraid to be outspoken. She wasn't afraid to stand up for her beliefs. No matter what, she believed in herself.

"Li Na's titles meant a lot more than just trophies as her success on the court has inspired a generation of Chinese tennis players.

"Just like Billie Jean, Li Na brought about social change and transcended her sport.

"When Li Na played her first-ever professional tennis match in 2000, there was only one WTA event in China. This year there are nine WTA events in China, more than any nation. The WTA Finals will make their debut in Shenzhen this year."

Eisenbud added of the player who reached a career-high No 2 in the world rankings: "Li Na, you've been an inspiration to millions of people to not just pick up a tennis racket, but to believe in themselves, not be afraid of a challenge and stand up for their beliefs."

Fighting back the tears, the 44-year-old Pierce, who won the 1995 Australian and 2000 French Opens, said: "The goal is only as worthy as the effect required to achieve it."