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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.
On the descent of the final climb of the day in stage 9 of the 2017 Tour de France, the Mont du Chat, number 5 in GC Richie Porte lost control of his bike. He slammed into the rock wall, taking down Dan Martin along. Porte sustained a fractured pelvis and collarbone.