LONDON, April 30 (Reuters) – For Rafael Nadal to bridge a 7,000-point gap with Novak Djokovic in the ATP rankings looks like a tall order, even for a player of his qualities, yet he could still threaten the Serb’s hopes of ending 2013 as world No.1. With the French Open looming large on the horizon, Nadal is back in the claycourt groove as he continues his comeback from a knee injury that sidelined him for seven months. …
