Lendl in it for the long haul
Ivan Lendl would be happy to coach Andy Murray for the rest of the Scot's career and believes he can get five times better.
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The pair linked up at the start of this season and it has been an unqualified success, with Murray winning Olympic gold and then breaking his grand slam duck at the US Open.
The two men have a lot in common, including winning their first grand slam title after losing in four finals, and enjoy each other's company.
The progress in Murray's game has been clear, with his forehand and second serve noticeably better, but it is on the mental side where Lendl seems to have had the most effect, instilling a belief in his man to maintain a positive approach.
Lendl is in Prague this weekend for the Davis Cup final, hoping to see his home country win the title for the first time since he helped Czechoslovakia to the crown in 1980.
The 52-year-old told the BBC World Service: "As long as it works for both of us, I can see myself being with him for the rest of his career.
"I have a lot of plans where I would like to see Andy end up with his game. I think (he can achieve) a lot more. I'm not going to say a number of grand slams, I'm just going to say where Andy is now. "I take point A - when we started working - now he's at point B, and when I envisage (where he can get to) I would say he's about 20 per cent there."
Murray is currently taking an end-of-season break after losing to Roger Federer in the semi-finals of the Barclays ATP World Tour Finals at the weekend but he will link up with Lendl again next month for pre-season training.
It will be the longest training spell the pair have had together as they prepare for the Australian Open in January and the 2013 season as a whole.
After Murray answered the question of whether he could win a grand slam, attention will now turn to whether the 25-year-old can end the long wait for a home winner at Wimbledon after his tearful loss to Federer in the final this year.
Lendl has no doubt that he can, and he said: "The question is 'is he going to win Wimbledon?', and know he will give it a good crack many, many times - not just once, not just in 2013 or 2014. He has quite a few years left in him and he's going to give it a crack.
"As you know in sport, you cannot predict, you can only anticipate - both Andy and I would be disappointed if at the end of the day he does not win."