'H is for haircut, M is for Mirza' - The A-Z of WTA Finals in Singapore
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X is for extraordinary. The last four years that Serena Williams has played the WTA Finals - in 2009 in Qatar, in 2012 and 2013 in Istanbul, and in 2014 in Singapore - she has come away with the title. (Getty)
Singapore hosts its fifth WTA Finals this week. Here we take a fond and fun look back on memorable moments from the previous four years before the move to Shenzhen.