The latest win came against Maria Sharapova whom she beat in the Madrid Open on Sunday.
In the process, she retains her number 1 ranking and collects her 50th career title.
The second-ranked Sharapova would have taken the top ranking with a win, but Williams stormed to an early lead as Sharapova struggled with her serve.
Despite Sharapova briefly recovering her poise in the second set, Williams’ form never dipped as she defended her title.
“It feels good,” Williams said of winning her 50th title. “I don’t know how many more I can win. Who knows if I will ever win another title? I just want to live the dream. Hopefully, I can keep it going.
“When you first start out everything is so exciting. Now I expect to win.”
Williams improved her record against Sharapova to 13-2, with her only two losses coming in 2004.
Meanwhile, Rafael Nadal saw off Stanislas Wawrinka 6-2, 6-4 for his fifth title since returning from a knee injury.
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