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6. Caroline Wozniacki

Caroline Wozniacki is perhaps the greatest Danish professional tennis player ever. She held the world No. 1 position for 67 weeks, becoming the only woman from a Scandinavian country to do so. Wozniacki holds some 25 WTA singles titles and plays defensively mostly. Her playing style is often labeled as counter-puncher, but she has a unique ability to turn defense into offense.