Substitute Steve Mounie has scored a late header as Brest climbed atop the French league standings with a 1-0 win over struggling Lyon.
New Lyon coach Fabio Grosso could not produce a jolt in his first match in charge and the seven-time champions remained winless and slumped to a fourth defeat in six league matches.
Grosso was appointed Lyon coach as a replacement for Laurent Blanc.
Lyon were on the back foot from the start as Jeremy Le Douaron came close to breaking the deadlock in the 24th minute.
Lyon goalkeeper Anthony Lopes had to make several saves to keep his team in the game but could not stop Mounie's header in the 87th minute from Kenny Lala's cross.
The result moved Brest one point clear of Nice at the top of the standings. It was the first time since the 2010-11 season that the small team from Brittany had taken top spot.
Earlier on Saturday, Nantes posted their second win of the season with a 5-3 win against Lorient.
Defending champion PSG host Marseille in France's biggest game on Sunday (Monday AEST).
Australian Associated Press
