World number one Rafael Nadal will face Florent Serra in the second round after the Frenchman beat Guillermo Canas, and there were first-round wins for Radek Stepanek, Ivan Ljubicic, Philipp Kohlschreiber, Robin Soderling and Andy Roddick.

BBC: Del Potro eases through in Paris

Federer and Nalbandian have been drawn in the Red Group of round-robin matches along with Ivan Ljubicic and Andy Roddick, who play later on Sunday.

BBC: SPORT | Tennis | Federer ready for Masters battle

Also with Derek Jacobi, Andy Garcia, Hanna Schygulla, and (in a hilarious cameo) Robin Williams.

NEWYORKER: Dead Again

"We lost Andy to an injury he sustained during a session on Tuesday, " said Wales forwards coach Robin McBryde.

BBC: Wales suffer Andy Powell injury blow

American Andy Roddick advanced with a 6-3 6-4 6-1 success over Dutch world No. 53 Robin Haase, and the 15th seed will next play fellow former world No. 1 Lleyton Hewitt of Australia.

CNN: Champion Djokovic backs calls for change in men's tennis