Ivan Lendl tells the Daily Telegraph that one of the reasons why Andy Murray is now a contender for major titles is that his fitness is much improved. Lendl, who coaches Murray, also noted that the 21-year-old Grigor Dimitrov is lacking in that department.

"If you train for five-hour matches, it gives you a lot of confidence. Take Grigor Dimitrov, who has played some great tennis against Andy and against Novak Djokovic this year," Lendl told the Daily Telegraph. "That guy comes out so hot, but we know, and so does Novak, he can’t sustain it. If he could he would be No. 1 in the world.

"It’s incredible effort that guy is putting in, incredible level. The first set between Andy and Dimitrov in Brisbane in January was the best tennis I have seen this year. If you can last at your level and he drops then all of a sudden you are the better player. That’s what the training is for.”