Lizzie Deignan, the British champion, on Saturday won the GP de Plouay one-day race in France.
The 27-year-old Boels-Dolmans rider won in a two-rider sprint ahead of France's Pauline Ferrand-Prevot (Canyon-Sram).
Australian Sarah Roy (Orica-Scott) led the peloton over the line to take third place.
The race consists of four laps of a 26.9-kilometre circuit with two main climbs.
Ferrand-Prevot and Deignan had a 20-second advantage into the finishing straight and the Yorkshirewoman was too strong for her rival.
Deignan, nee Armitstead, won the race in 2015 ahead of her victory in the Road World Championships in Richmond, Virginia.
The London 2012 Olympic silver medallist will also be targeting success in the Road World Championships in Bergen, Norway next month.