I just finished re-reading Ronald Reng's "A Life Too Short" about the German soccer goalie Robert Enke who was on his way to become the top choice for the German national team for the 2010 World Cup. However, suffering from depression, Enke killed himself in November 2009. Reng's book is powerful testimony how even highly successful individuals can be afflicted by depression. The book won several awards, including British Sports Book of the Year.
For some lighter entertainment, try "The Keeper of Dreams" by the same author. It chronicles the career of another German goalie who, coming from a forth division soccer club in Germany, suddenly ended up in the English Premier League. Especially enlightening are the accounts of day-to-day life in the Premier League, which is not always so glamorous.