World's top two seeds, Spain's Rafael Nadal and Serbia's Novak Djokovic have stormed into the finals of the ATP World Tour Finals Tennis event at London, England. In the Men's Singles semi-finals last night, world number one Nadal defeated Swiss Roger Federer, 7-5, 6-3, while world number two Djokovic beat Stanislas Wawrinka, 6-3, 6-3.Meanwhile, two Men's Doubles final berths have also been decided. America's top seeded Bryan brothers, Bob and Mike, and the Spanish duo of Fernando Verdasco and David Marrero defeated their respective opponents and made it to the finals.Both the final matches will be played today.