Barclays ATP World Tour Finals: Day 1

David Marrero (L) and Fernando Verdasco (3rdL) of Spain celebrate victory in their men's doubles match against Marcel Granollers and Marc Lopez of Spain during day one of the Barclays ATP World Tour Finals at O2 Arena on November 4, 2013 in London, England.
(Nov. 3, 2013 - Source: Julian Finney/Getty Images Europe)