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Andy Murray waves goodbye - Source: Reuters -
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Britain's Andy Murray will play US Open champion Juan Martin del Potro in the opening Group A round-robin match of the ATP World Tour finals on Monday.
World number one Roger Federer, who lost to Argentine Del Potro in the US final at Flushing Meadows in September, meets Spain's Fernando Verdasco in the day's second game at London's O2 Arena.
Spain's Rafael Nadal begins his campaign in Group B on Tuesday against Robin Soderling, the Swede who ended his four-year reign at the French Open in May.
Soderling, beaten in the Roland Garros final by Federer, has replaced American Andy Roddick who withdrew from the event on Tuesday with a knee injury.
Serbian Novak Djokovic, the world number three who won the Tour title in Shanghai last year, plays Russian Nikolay Davydenko in the world's biggest indoor tennis event.
One million pounds is up for grabs if a player wins the title in London undefeated, more than the 850,000 pounds Federer collected for winning his sixth Wimbledon crown this year.
