Serena Williams best ever, but I'm closing gap, says Victoria Azarenka

Updated: 22 September 2013 16:41 IST

Azarenka, who has held the world's top ranking, called her 7-5, 6-7, 6-1 defeat at the US Open a "learning experience" but pointed to two victories over Williams in 2013 as evidence she had the game to threaten the dominance of the 17-time grand slam singles champion.

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