Big-hitting American also makes it into the semis in UAE.
American Serena Williams came from a set down to beat Petra Kvitova 3-6, 6-3, 7-5 in the quarter-finals of the Qatar Open on Friday, in the process becoming the oldest-ever women’s world No 1.
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Williams, 31, will take over from Australian Open champion Victoria Azarenka as the world’s top 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.
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