Novak Djokovic got the defence of his Wimbledon title off to an impressive start when, serving superbly, he overwhelmed Germany`s Philipp Kohlschreiber in straight sets in the first match on Centre Court on Monday.After a few early wobbles Djokovic triumphed 6-3 7-5 6-3 as, perhaps already buoyed by the presence of new coach Goran Ivanisevic, he really hit the mark with his serves.
