Prime7

World rankings - men (December 31)

1        Novak Djokovic (SRB)
2        Roger Federer (SUI)
3        Andy Murray (GBR)
4        Rafael Nadal (ESP)
5        David Ferrer (ESP)
6        Tomas Berdych (CZE)
7        Juan Martin del Potro (ARG)
8        Jo-Wilfried Tsonga (FRA)
9        Janko Tipsarevic (SRB)
10       Richard Gasquet (FRA)

World rankings - women (December 31)

1        Viktoria Azarenka(BLR)
2        Maria Sharapova (RUS)
3        Serena Williams (USA)
4        Agnieszka Radwanska (POL)
5        Angelique Kerber (GER)
6        Li Na (CHN)
7        Sara Errani (ITA)
8        Petra Kvitova (CZE)
9        Sam Stosur (AUS)
10       Caroline Wozniacki (DEN)