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.
