Andy Murray hails impact of Ivan Lendl

World number four Andy Murray has praised the instant impact of new coach Ivan Lendl.

Murray appointed Lendl in December before reaching the semi-finals of the Australian Open, where he was defeated in five sets by Novak Djokovic.

The British number one said: "I spent five days with him before the Australian Open and I feel like I improved just in those days.

"Sometimes things can just click and you can make big improvements, and I feel like I made a big improvement in Australia.

"I'll go and spend a lot more time with him and work harder, and that's really all that you can do."

Murray has yet to win a Grand Slam tournament in his career.