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Images from Day 6 of the ATP World Tour Finals at the O2 Arena on November 10, 2012 in London, England.

Bob Bryan and Mike Bryan

Bob Bryan (L) and Mike Bryan of the United States collide as they jump to smash the ball during their men's doubles match Radek Stepanek of Czech Republic and Leander Paes of India during day six of the ATP World Tour Finals at O2 Arena on November 10, 2012 in London, England. © Gallo Images

Radek Stepanek and Leander Paes

Radek Stepanek (R) of Czech Republic celebrates with Leander Paes of India after their men's doubles match against Mike Bryan and Bob Bryan of the United States . © Gallo Images

Juan Martin Del Potro

Juan Martin Del Potro of Argentina returns a shot through his legs during his men's singles match against Roger Federer of Switzerland . © Gallo Images

Roger Federer

Roger Federer of Switzerland reacts during his men's singles match against Juan Martin Del Potro of Argentina. © Gallo Images

Juan Martin Del Potro

Argentina's Juan Martin Del Potro celebrates winning his group B round robin. © Action Images

Juan Martin Del Potro and Roger Federer

Switzerland's Roger Federer (R) congratulates Argentina's Juan Martin Del Potro. © Action Images

Janko Tipsarevic

Janko Tipsarevic of Serbia walks onto court prior to his men's singles match against David Ferrer of Spain. © Gallo Images

David Ferrer

David Ferrer of Spain returns a shot during his men's singles match against Janko Tipsarevic of Serbia. © Gallo Images

Janko Tipsarevic

Janko Tipsarevic of Serbia attempts to smash the ball during his men's singles match against David Ferrer of Spain. © Gallo Images

David Ferrer

Spain's David Ferrer in action during his group B round robin match. © Action Images

Bob Bryan (L) and Mike Bryan of the United States collide as they jump to smash the ball during their men's doubles match Radek Stepanek of Czech Republic and Leander Paes of India during day six of the ATP World Tour Finals at O2 Arena on November 10, 2012 in London, England. <em> © Gallo Images</em>

Radek Stepanek (R) of Czech Republic celebrates with Leander Paes of India after their men's doubles match against Mike Bryan and Bob Bryan of the United States . <em> © Gallo Images</em>

Juan Martin Del Potro of Argentina returns a shot through his legs during his men's singles match against Roger Federer of Switzerland . <em> © Gallo Images</em>

Roger Federer of Switzerland reacts during his men's singles match against Juan Martin Del Potro of Argentina. <em> © Gallo Images</em>

Argentina's Juan Martin Del Potro celebrates winning his group B round robin. <em> © Action Images</em>

Switzerland's Roger Federer (R) congratulates Argentina's Juan Martin Del Potro. <em> © Action Images</em>

Janko Tipsarevic of Serbia walks onto court prior to his men's singles match against David Ferrer of Spain. <em> © Gallo Images</em>

David Ferrer of Spain returns a shot during his men's singles match against Janko Tipsarevic of Serbia. <em> © Gallo Images</em>

Janko Tipsarevic of Serbia attempts to smash the ball during his men's singles match against David Ferrer of Spain. <em> © Gallo Images</em>

Spain's David Ferrer in action during his group B round robin match. <em> © Action Images</em>