No wheelies today I'm afraid.
It's really impressive how different each of Sagan's worlds wins have been.
2015) Wins on his own after attacking a few km out
2016) Beat Cav and the rest in a bunch sprint
2017) Beats Kristoff in a sprint from a largish reduced group
Now he just needs to add a Gilbert-style 100 km solo attack, plus a cat & mouse game with another escapee rider as the bunch charge down their tails, and he'll have the complete set.