Red Bull KTM Factory Racing's Antonio Cairoli dominated the MX1 class, taking exactly half of the victories on offer; 15 victories and 23 podiums in total allowed him to claim his second successive championship title by 88 points, scoring points in all bar two races.
Clément Desalle took a career-best second-place finish in the standings, riding for the Teka Suzuki team.
Musquin started the season with consecutive doubles at Sevlievo and Mantova before adding further doubles at Águeda, Glen Helen and Saint-Jean-d'Angély en route to a grand total of 14 victories, 23 podiums and a championship-winning margin of 61 points over runner-up Ken Roczen of the Teka Suzuki team.
Yamaha's Carlos Campano and Husqvarna's Alex Salvini shared 18 of the season's 24 race wins between them, but it was Campana that prevailed for the championship, by 24 points.
Other victories were taken by riders during one-off appearances; Mickaël Pichon and Julien Bill claimed doubles at their respective home events at Castelnau-de-Lévis and Geneva, while Toni Eriksson took one win at Vantaa.