The psychologist who Andy Murray put on winning path to US Open success Andy is a creative genius, a tactical and technical genius, so he needed to reconnect with his inner strengths. It's natural that when someone puts their heart and soul into what they're doing, they sometimes forget how much enjoyment they once took from it. Andy has lofty goals and he is hard on himself. In that situation, you need to remember that you love the battle, that's why you are out there. Murray was once described as "one of the most negative people I've ever met" by his former coach Brad Gilbert. When the two men were working together in the mid-2000s, Gilbert suggested that Murray was depressed and that he should see a psychologist - though the one he eventually visited could not find anything wrong. Since then, Murray has dramatically improved his demeanour on the court and, for the most part, stopped shooting dirty looks and sarcastic comments at his players" box. It is hard to see him ever beaming his way through life like Jo-Wilfried Tsonga, but his practice sessions with Lendl are quirky and fun, and the strength of their relationship can be judged by the way he invariably smiles when he is asked about his new coach. "I have never found Andy gloomy," said Castorri, who speaks to Murray every two or three weeks and meets him whenever he visits his American base in Miami. I love working with him: he's a delightful, sensitive, happy, funny, sensitive young man. And he was completely open with me from the first conversation. Castorri has known Lendl since 1985, when she approached him after a defeat to Stefan Edberg to promise that she could to turn him into a world No 1. Her solution was unorthodox, involving aerobics, "Jazzercise" and yoga, but seven months later Lendl beat John McEnroe in the US Open final in what he still considers to be his greatest performance, and moved to No 1 for the first time. "My instinct with Ivan the minute he came into the room was that he was a very stiff person - he even walked in a stiff way," says Castorri now. So we worked to loosen up the body a little bit and add some flexibility. He is very much a one-off, and that's what I find when I work with high-profile people: they are unique personalities. In Andy's case, I have heard that he hasn't always been fully supported by the whole of the UK but he is tenacious and he sticks to his mission. After the way he spoke when he lost the Wimbledon final this year, perhaps more people have warmed to him, because he was revealing a side of himself that they hadn't seen before. It's a simple lesson but if you can learn to be yourself - the most positive form of yourself - then good things tend to happen.