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If the article has caught your interest, it is definitely worth having a read of Pete's biography (A Champion's Mind: Lessons from a Life in Tennis).

I would add that it is also worth reading Agassi's biography (Open: An Autobiography).

Together, these books provide a unique insight into life at the top of the game - and the impact this has on their lives. As a bonus, the views are from two players who were very different characters, were viewed in the media as being very different, and brought the best out in each other.