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Key events can be any memorable event, for example an impressive victory but also a major crash, bold solo or anything that makes for sporting memories.
With 5k to the top of Alpe d'Huez in stage 19 of the 2011 Tour de France, Alberto Contador was in pursuit of the break for the stage win when a fan came at him dressed as a doctor. Without hesitation Contador hit him with a right uppercut.