Serbia's Novak Djokovic celebrates with sparkling wine after winning the final match at the Italian Open tennis tournament, in Rome, Sunday, May 17, 2015. Top-ranked Novak Djokovic bolstered his clay-court credentials a week ahead of Roland Garros with a convincing 6-4, 6-3 win over Roger Federer on Sunday to capture his fourth Italian Open title. (AP Photo/Alessandra Tarantino)