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Agnieszka Radwanska
Williams guaranteed year-end number one ranking
Williams guaranteed year-end number one ranking

SINGAPORE (Reuters) - Serena Williams clinched the year-end world number one ranking for the fourth time without hitting a ball on Friday after Maria Sharapova, the only woman with any chance of overtaking her, was eliminated from the WTA Finals. Needing to win in straight sets to stand any chance of advancing to the semi-finals, Sharapova lost the second set of her match against Poland's Agnieszka Radwanska at Singapore's Indoor Stadium, ending her slim hopes of leapfrogging Williams for the top spot. Sharapova had led 7-5 5-1 and appeared to be cruising towards victory but Radwanska dug deep to reel off five straight games and force a tiebreak, which she won 7-4 to even up...