Serena Williams of the United States celebrates after winning the WTA Qatar Open tennis quarterfinal against Petra Kvitova of Czech Republic in Doha, capital of Qatar, on Feb. 15, 2013. Serena Williams whose upcoming 32-birthday in September beat her compatriot Chris Evert who held the top ranking in 1985 just shy of her 31st birthday, to become the oldest woman to hold the No. 1 ranking. (Xinhua/Chen Shaojin)
