Del Potro squeaks into semifinals
LONDON -- Juan Martin del Potro squeaked into the semifinals of the ATP World Tour Finals by beating Roger Federer 6-2, 6-7 (5), 6-3 Thursday -- the slimmest possible margin to advance and knock Andy Murray out of the tournament.
The result means Del Potro and Federer both advance after a three-way tie in Group A, with Murray's elimination literally coming down to the last game after three rounds of group matches.
All three players finished the round-robin stage with two wins and identical ...
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