Though the parcours of the remaining stages of this year's race mean Sagan is unlikely to repeat his overall win, he proved to be the fastest man in the race as the opening stage to and from San Diego came down to a bunch sprint.
While other big names like Mark Cavendish (Dimension Data) and Alexander Kristoff (Katusha) where unable to get themselves to the front in the finale, Sagan powered his way through the hectic peloton and thrust his bike forward over the line for a narrow win over Cannondale's Wouter Wippert and LottoNL-Jumbo's Dylan Groenewgen.
Watch how the day unfolded, from the early breakaway to the sprint finish, in our highlights video above.
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