I once watched Maria Sharapova play tennis live. It was the fourth round of the French Open in 2014 against Sam Stosur. Sharapova lost the first set, but it was clear that this would only delay the inevitable. What followed was more like retribution than just a comeback: Sharapova won the last nine games in a row. She went on to win the tournament for the second time. What was obvious from the stands was that she possessed an unrivalled competitive ferocity. She was an irresistible force. Pure box office.
Two years later, in June 2016, there was

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