At the beginning of his career, Federers attitude was not good. His temperament often got the better of him. Then he made a conscious change to look ice cool, to appear in control. The hunger to stay at the top requires a special mentality and he was there for many years. Im sure he got nervous but he was able to deal with the pressure. He also accepted that he had to make changes to his game, even when he was at No 1.

Federer came to Glasgow to play Andy Murray in 2017, and I sat next to his coach, Ivan Ljubicic. He played a couple of early forehands perfectly down the line. Ivan said: Its incredible how quickly he sees an opportunity. I

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Ice cool temperament and a beautifully smooth serve the anatomy of Roger Federer - The Times