Lens ousted Marseille from second place in the French Ligue 1 on Sunday with a 3-2 victory that condemned the southern giants to a first loss of the season and a first defeat in the home league at the Vélodrome since February.
Lens have 15 points but are nine behind leaders Paris Saint-Germain, who have eight out of eight perfect wins.
Marseille goes down to third place, one more point but with one game less.
Lens led 2-0 in the first 27 minutes, Florian Sotoca scoring from the penalty spot and Poland international Przemyslaw Frankowski adding the second.
In a roller coaster first half, Dimitri Payet then brought Marseille back to equality with a goal in the 33rd minute and a penalty in stoppage time.
But Wesley Said settled the shock for Lens with a winner in the 71st minute after being set up by the impressive Sotoca.
The game came after a stormy week for both clubs, with Lens banning some fans for 18 months after a pitch invasion against bitter rivals Lille.
Marseille supporters, meanwhile, clashed with Angers spectators in the middle of the week.
Wissam Ben Yedder and Kevin Volland both scored as Monaco came from behind to beat Clermont 3-1 and claim successive victories for the first time this season.
Guinean striker Mohamed Bayo scored his fourth goal this season to give newcomers Clermont an early lead, but Ben Yedder scored for the third game in a row to bring Monaco back to level in the 25th minute.
Volland, like Ben Yedder also on target in the midweek victory over Saint-Etienne, struck early in the second half before Sofiane Diop added a third third as Niko Kovac’s side went on to strike. is hoisted in the first half of Ligue 1.
Monaco will travel to Spain next week to face Real Sociedad in the Europa League, having won their first group home game against Austria’s Sturm Graz.
Metz claimed their first victory of the campaign after beating compatriots Brest 2-1 in Brittany.
Teenager Hugo Ekitike scored twice as a substitute to secure Reims a 3-1 victory over Nantes, while Troyes drew 1-1 at home against Angers.
Mozambican international Edson Mexer equalized late in the game for Bordeaux in a 1-1 draw against Rennes.
PSG won eight out of eight victories on Saturday with a 2-0 home victory over Montpellier despite the absence of Lionel Messi, sidelined by a knee bruise.
© 2021 AFP