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Tennis' year-end championships are supposed to showcase the top eight players in the world but Monday's opening matches in London took a backseat to another butting of heads between the two biggest names in the sport.
The difference of opinion came as Stanislas Wawrinka beat Tomas Berdych 6-3 6-7 6-3 in the afternoon and Juan Martin del Potro defeated Richard Gasquet 6-7 6-3 7-5 in the nightcap.
Having disagreed about a potential two-year ranking system and a previous selection of the ATP's executive chairman, the latest dispute between Roger Federer and Rafael Nadal revolves around the surface for the World Tour Finals.
Switzerland's Federer says the tournament should remain on an indoor hard court but Spaniard Nadal wants it played outdoors and on surfaces including his preferred clay,[url=http://www.lockshoe.com]nike løbesko[/url].
Read: Why the ATP Finals are the best tournament of the year
Federer and his attacking game flourish under a roof -- he was unbeaten on indoor hard courts for two years from late 2010 -- and the 17-time grand slam winner boasts a career winning ratio of over 80% when playing inside.
Nadal's indoor strike rate,[url=http://www.lockshoe.com/nike-running-shoes-24]nike free[/url], meanwhile, stands at about 66% -- and the world No. 1 has even less success on carpet. Clay is undeniably his most successful surface, with eight of his 13 grand slam triumphs coming at the French Open.
Nadal has never won the ATP World Tour Finals while Federer has on six occasions,[url=http://www.lockshoe.com/nike-running-shoes-24]billige nike free[/url], with four of those coming indoors -- Houston in 2003 and 2004 proving the exception.
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"I believe it should be indoor and hard," Federer, president of the ATP Players Council, told CNN on Sunday. "I know there's an argument to have it on clay,[url=http://www.lockshoe.com/nike-air-max-sko-21]nike air max[/url], on grass, to have it outdoors -- and I did play outdoors in Houston.
"I just feel indoors doesn't have enough play. The indoor season is small. I believe indoors deserves a huge event,[url=http://www.lockshoe.com/nike-shox-sko-22]billige nike sko[/url], which this one is."
Playing the tournament in such fashion is a natural extension of the European "indoor swing&quot,[url=http://www.lockshoe.com]nike shox[/url]; that begins in the middle of October.
Prior to London,[url=http://www.lockshoe.com]nike sko[/url], Shanghai staged the year-end showpiece on an indoor carpet and then on an indoor hard court from 2005 to 2008.