Argentina's Juan Martin del Potro claimed a crucial 7-6 (7/3), 4-6, 6-3 victory over defending champion Roger Federer on Saturday to book his place in the semi-finals of the ATP Tour Finals.
Argentina's Juan Martin Del Potro returns against Switzerland's Roger Federer in their group B singles match on the sixth day of the ATP World Tour Finals tennis tournament in London. Del Potro claimed a crucial 7-6 (7/3), 4-6, 6-3 victory Federer to book his place in the semi-finals of the ATP Tour Finals.
Del Potro's victory ended Federer's 12-match winning run at the season-ending event and guaranteed he will qualify from Group B along with the Swiss star.
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