Del Potro claims final spot in Tour Finals semis
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Juan Martin del Potro earned the fourth and final berth in Sunday's semifinals at the season-ending ATP World Tour Finals by outlasting six-time tournament champion Roger Federer in three sets during Saturday's final day of round-robin play.
Del Potro bested Federer, who had already secured a spot in the semifinal round, by a 7-6 (7-3), 4-6, 6-3 score to advance. The accomplished Argentine earned a pivotal break of the 17-time Grand Slam champion to go up 2-0 in the final set, then held serve the rest of the way to conclude his Group B bracket with an identical 2-1 record as Federer.
However, Federer proved to be the winner of Group B due to fourth-seeded David Ferrer's 4-6, 6-3, 6-1 victory over eighth-seeded Janko Tipsarevic. Federer topped both Ferrer and Tipsarevic earlier in the event. Del Potro finished second in Group B.
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Federer, seeded second, has claimed the title at this prestigious eight-player event in each of the past two years.
World No. 1 Novak Djokovic won the Group A bracket after going 3-0 in his round-robin bouts, with third-seeded and crowd favorite Andy Murray also advancing after the British Olympic champion posted a 2-1 overall mark.
On Sunday, Djokovic will take on del Potro and Federer will do battle with Murray. The winners will square off in the lucrative finale Monday night.
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The 2012 World Tour Finals champion can earn as much as $1.76 million.