Switzerland's Stanislas Wawrinka hits a return to France's Jo-Wilfried Tsonga during their men's semi-final match at the French Open in Paris on June 5, 2015Paris (AFP) – Stan Wawrinka once seemed doomed to life as Roger Federer’s warm-up act with the French Open finalist’s self-esteem so low that he even lived in awe of the “mutants” who won Grand Slam titles.

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