Berlin - Serena Williams maintained her substantial lead at the top of the women's tennis rankings issued on Monday by the WTA.
The American has 13 260 points with nearest challenger Victoria Azarenka in second place with 8 151. Williams faces Ash Barty in the first round of the Australian Open on Monday.
WTA top 10 as of January 13 (previous ranking in parenthesis):
10. (10) Caroline Wozniacki, Denmark, 3 520