Italy's, from left, Francesca Schiavone, Flavia Pennetta, Sara Errani, Karin Knapp and Roberta Vinci celebrate with the trophy after winning the Fed Cup tennis final match against Russia, in Cagliari, Italy, Saturday, Nov. 3, 2013. Italy won a fourth Fed Cup title with a whitewash 4-0 victory over Russia on Sunday as seventh-ranked Sara Errani cruised past Alisa Kleybanova before Flavia Pennetta and Karin Knapp won the dead doubles rubber. (AP Photo/Max Solinas)

Simona Halep of Romania, right holds her trophy after defeating Samantha Stosur of Australia, left, at the awarding ceremony on the final of the WTA Tournament of the Champions in Sofia, Bulgaria, Sunday, Nov. 3, 2013. (AP Photo/ Valentina Petrova)

LONDON, ENGLAND - NOVEMBER 03: Rafael Nadal of Spain discusses tatics with his coach Toni Nadal during a practice session prior to the start of ATP World Tour Finals Tennis at O2 Arena on November 3, 2013 in London, England. (Photo by Clive Brunskill/Getty Images)

LONDON, ENGLAND - NOVEMBER 03: Roger Federer of Switzerland during his press conference prior to the start of ATP World Tour Finals Tennis at O2 Arena on November 3, 2013 in London, England. (Photo by Clive Brunskill/Getty Images)

PARIS, FRANCE - NOVEMBER 03: Footballer Zlatan Ibrahimovic watches on as David Ferrer of Spain plays Novak Djokovic of Serbia in the final during day seven of the BNP Paribas Masters at Palais Omnisports de Bercy on November 3, 2013 in Paris, France. (Photo by Julian Finney/Getty Images)

PARIS, FRANCE - NOVEMBER 03: Novak Djokovic of Serbia is congratulated by David Ferrer of Spain in the final after Djokovic won in straight sets during day seven of the BNP Paribas Masters at Palais Omnisports de Bercy on November 3, 2013 in Paris, France. (Photo by Julian Finney/Getty Images)