Federer beats Del Potro to set up semi with Nadal at World Tour Finals

Swiss tennis ace Roger Federer has set up a semi-final showdown with Rafael Nadal at the ATP World Tour finals after beating Juan Martin del Potro 4-6, 7-6, 7-5 in their Group B match at London's O2 Arena.

According to Sport24, victory meant he qualified for the last four as group runner-up to defending champion Novak Djokovic who will face Federer's fellow Swiss Stanislas Wawrinka in Sunday's other semi-final.

Federer had only once fallen in the round-robin phase of the season-ending tournament in 11 previous appearances and never since the tournament switched to London in 2009, the report said.

Novak Djokovic beat Richard Gasquet 7-6, 4-6, 6-3 in the other match of the day.