In August 2012, Demare won the first World Tour race of his career by prevailing in the Vattenfall Cyclassics, ahead of local favorite André Greipel and Giacomo Nizzolo. Démare clearly dominated the mass sprint contested in scorching heat at the end of the 245.6 km (152.6 mi) race.

In 2013, Démare won 3 stages in a row at the Four Days of Dunkirk and the general classification. On the third stage, his team-mate and lead-out rider Geoffrey Soupe produced a final power surge to launch Démare, and the duo finished one-two in the mass sprint, with Ramon Sinkeldam of Argos–Shimano taking third place.

Démare won the Four Days of Dunkirk stage race for the second year in succession, winning two stages during the event. He also won the points and young rider classifications. He also put in some strong performances in the cobbled classics, finishing second in Gent–Wevelgem and twelfth in Paris–Roubaix.

Démare struggled for form for much of the 2015 season, only scoring one top ten finish in the spring classics with a tenth place in Omloop Het Nieuwsblad. He did however manage to score two stage wins in the Tour of Belgium.

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Wikipedia