Jeff Passan source:

Federer tops del Potro, reaches semis in London

AP - Sports
Federer advances to face Nadal in ATP semifinal

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Juan Martin Del Potro of Argentina shouts as he wins the first set against Roger Federer of Switzerland …

LONDON (AP) -- Six-time champion Roger Federer rallied past Juan Martin del Potro 4-6, 7-6 (2), 7-5 Saturday to reach the semifinals of the ATP World Tour Finals for an 11th time.

Federer will face top-ranked Rafael Nadal on Sunday, and Novak Djokovic will take on newcomer Stanislas Wawrinka in the other semifinal at the year-end tournament.

Federer and del Potro needed a win in their final round-robin match to advance from Group B.

Only once in 12 appearances has Federer failed to reach the final four. The 17-time Grand Slam winner has struggled this season, and the event featuring the top eight players is his last chance to win a big title in 2013.

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