French Open: Novak Djokovic says, I remain motivated

Novak Djokovic's bid to become the first man in half a century to win all four Grand Slam titles twice got off to a straightforward start on Tuesday at Roland Garros as a 'double bounce' row prompted calls for video replays to be introduced in tennis. World No. 1 Djokovic, returning to Grand Slam action for the first time since...