Alexander Kristoff of Norway sprinted to victory in the first stage of Paris-Nice on Monday to claim his fifth win this season as former world champion Tom Boonen retired with a broken collarbone . The Katusha rider edged Frenchmen Nacer Bouhanni and Bryan Coquard in the finale of the 122.1-mile stage from Saint-Remy-les-Chevreuse to Contres that was marred by Boonen 's crash . The one-day classics specialist heavily hit the ground about 10.6 miles from the finish after colliding with another rider . Alexander Kristoff of Norway celebrates winning the first stage of Paris-Nice on Monday . Kristoff will continue in the race on Tuesday with a 107 mile trek to central France . Boonen withdrew from the race and his upcoming classics campaign could be in jeopardy . Michal Kwiatkowski , who won Sunday 's prologue , retained the race leader 's yellow jersey . The race continues Tuesday with a 106.9-mile trek from the ZooParc de Beauval zoological park to Saint-Amand-Montrond in central France .
Norway 's Alexander Kristoff lays down gauntlet winning stage one . The first of the three stages was won by Norwegian rider Alexander Kristoff, who took his second win in a row after finishing third on Saturday. Tom Boonen crashed and broke his collarbone 11 miles from the end .