Viviani takes 75th career win after crash on two kilometers to go reduced the field.
The final sprint battle in Paris is as much a test of positioning through the vital final chicane and a rider's ability to endure 20 grueling stages as it is of their top top-end speed.
Just three flat stages remain at this year's Tour de France, and the race's pure sprinters must survive the hills and hight mountains to reach them
Elia Viviani out sprinted Alexander Kristoff in downtown Nancy to win the Tour's fourth stage
Italian's sprint-machine is all about integration and minimal frontal area to give every advantage possible for the fast finishes.