Juan Martin del Potro faces Janko Tipsarevic in their second game at the round robin stage of the ATP World Tour Finals.
Both the Argentinian and the Serb are searching for their first victories of the tournament. A loss today could really injure their players' chances of advancing to the semifinals of the competition.
Roger Federer defeated David Ferrer earlier today, so he's 2-0 and the only undefeated player left in Group B.
Tipsarevic fell victim to Federer in their first game of the tournament. Federer beat the Serb in two straight sets 6-3, 6-1. Meanwhile, del Potro lost a close match 6-3, 3-6, 6-4 to Ferrer.
This match between del Potro and Tipsarevic will immediately follow the Ryan Brothers' vs. Qureshi- Rojer game who are in the Men's Doubles tournament at the ATP World Finals.
Del Potro has never lost to Tipsarevic as he is 3-0 against in their previous meetings.
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