Franck Haise's Lens, most effective of their 2d season returned inside the French top flight, have been trying to circulate back inside 10 points of league leaders Paris Saint-Germain. But a nightmare first half positioned paid to any hopes of that, as Steve Mounie gave Brest a third-minute lead earlier than dreams from Brendan Chardonnet and the in-form Romain Faivre made it three at the damage.
Lens' depressing afternoon changed into completed in the 2d half of as Jeremy Le Douaron delivered a fourth for the hosts within the 69th minute and the away aspect noticed alternative Arnaud Kalimuendo despatched off.
The end result leaves Rennes in 2nd, 12 factors at the back of PSG, after extending their unbeaten run to eleven suits in all competitions with a 2-zero win over Montpellier on Saturday.
Lionel Messi scored his first Ligue 1 goal as PSG stretched further clean with a three-1 victory against Nantes.
Nice, who visit Clermont, and Marseille, who tackle Lyon, can each leapfrog Lens later on Sunday.
