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.
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 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.
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