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Here is my Stage 4 notebook entry:
Pave or cobblestones -- whatever you want to call them, they defined this stage. All the favorites did well -- especially Nibali & Froome, who not only stayed in the front when the peloton split, but drove the race through some of the most difficult pave sections. But then the real shining star at the end was Tony Martin, who after switching a bike with a teammate within the last 10K, then pulled ahead of the pack to win the stage. Amazing! After three stages of disappointment, it was wonderful to finally see him take yellow.