BASEL, SWITZERLAND: Roger Federer of Switzerland looks on in his match against Andreas Seppi of Italy during Day Three of the Davidoff Swiss Indoors Tennis at St Jakobshalle.
Photograph by: Julian Finney
Credit: Getty Images

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Group B in the end-of-season showpiece event features former wold number one Rafael Nadal, recent Paris Masters champion Novak Djokovic, Nikolay Davydenko and late-entrant Robin Soderling.

Soderling had failed to qualify for the eight-man event but was brought in following the withdrawal of Wimbledon finalist Andy Roddick, who has not played since injuring his left knee in Shanghai last month.

Frenchman Jo-Wilfried Tsonga is now on standby in case of any other withdrawals.

The top two players in each of the round robin groups advance to the semi-finals of the tournament, which starts Sunday at London's O2 Arena. The final is on November 29.