Lendl feels potential is far from being realised

Murray claimed a thrilling five-set victory against Novak Djokovic on Monday night in New York.

And Lendl, who like Murray lost four grand slam finals before winning his fifth, is hopeful the Briton can take his career to a new level.

Lendl, who retired having won eight major titles, said: “I’m very happy for him. It’s a great achievement for him and let’s hope he can continue and rack up many more.”

The Czech, who joined Murray’s team last December, added: “You cannot help somebody in one week, you cannot do that in one month and hopefully we are not anywhere near where Andy can be.”

Sheffield’s Roger Taylor, a four-time grand slam semi-finalist and former British No 1, believes Lendl’s contribution cannot be overlooked.

The 70-year-old said: “So much confidence has come from Andy’s Olympics win and Lendl has added a great presence.

“Andy respects him and Ivan has realised Andy needs to play closer to the baseline.

“He (Lendl) has made a great difference; he is a great character and has gelled the team together.”

Another former British No 1, Greg Rusedski, who tasted defeat in the 1997 US Open final, believes Lendl has helped Murray to be mentally tougher.

“At the end of the day he found a way to get it done and found a way to control his emotions,” Rusedski said.

“He can thank Ivan Lendl for that. You have to give him so much credit for what he’s done, to keep believing in what he’s done.

“It shows you what a champion he is and, having won this, he can go on to win many majors.”