Williams remains on 13,000 points, well clear of next challengers Victoria Azarenka (Belarus) on 6,581 and Australian Open winner Li Na on 6,570.
There were no changes in the top 10. The next stop on the women’s tour is the Qatar Open which begins in Doha February 10.
In the Men’s ATP rankings, Rafael Nadal remains top of log ahead of Serbia’s Novak Djokavic and Australian Open winner Statislas Wawrinka of Switzerland.
With Davis Cup being played at the weekend there were few changes in the rankings with no movement in the top 10 players.
The only alteration in the top 25 saw Kai Nishikori of Japan skip Spain’s Nicolas Almagro to go 17th.