Results on Wednesday from the third day of the $795,000 WTA Family Circle Cup: 2nd round Madison Keys (USA) bt Grace Min (USA) 6-4, 6-3 Eugenie Bouchard (CAN) bt Laura Robson (GBR x16) 6-4, 3-6, 6-1 Julia Goerges (GER x10) bt Olga Govortsova (BLR) 6-2, 0-6, 6-3 Caroline Wozniacki (DEN x2) bt Silvia Soler-Espinosa (ESP) 6-1, 6-1 Mallory Burdette (USA) bt Sabine Lisicki (GER x15) 3-6, 7-6 (7/5), 7-5 Samantha Stosur (AUS x3) bt Marina Erakovic (NZL) 6-1, 6-2 Andrea Petkovic (GER) bt Vania King (USA) 7-5, 6-4

Serena Williams on Friday became the oldest woman to claim the world number one ranking when she reached the Qatar Open semi-finals with a 3-6, 6-3, 7-5 win over Petra Kvitova. Williams, 31, will take over from Australian Open champion Victoria Azarenka as the world's best player on Monday, returning to the top spot for the first time in over two years. Chris Evert at 30 was the previous oldest world number one.

MELBOURNE, Jan 26 (Reuters) - List of Australian Open women's singles champions since the event began in 1922 (Australian unless stated): 2013 Victoria Azarenka (Belarus) bt Li Na (China) 4-6 6-4 6-3 2012 Victoria Azarenka (Belarus) bt Maria Sharapova (Russia) 6-3 6-0 2011 Kim Clijsters (Belgium) bt Li Na (China) 3-6 6-3 6-3 2010 Serena Williams (U.S.) bt Justine Henin (Belgium) 6-4 3-6 6-2 2009 Serena Williams (U.S.) bt Dinara Safina (Russia) 6-0 6-3 2008 Maria Sharapova (Russia) bt Ana Ivanovic (Serbia) 7-5 6-3 2007 Serena Williams (U.S.) bt Maria Shara