Guingamp thrashed outgoing champions Monaco 3-1 as the visitors failed to recover from losing Radamel Falcao in the warm-up and Jemerson to a red card.
EA Guingamp 3-1 AS Monaco
The night began badly for Monaco as Falcao suffered a muscular alert in the warm-up and was replaced in the starting line-up by Adama Diakhaby. It got worse from there for Leonardo Jardim's side as they suffered back-to-back Ligue 1 Conforama defeats for the first time since November. Monaco are still second but now only a point clear of Olympique Lyonnais and Olympique de Marseille, both big winners this weekend.
Guingamp now have an outside chance of European qualification, although Antoine Kombouaré's team are still to go to PSG and to host OM. The Breton club were on the top from the off and - had they taken all their chances - could have matched the 7-1 scoreline PSG inflicted on Monaco six days previously.
Monaco were down to ten men (21') when Jemerson handled a Marcus Thuram shot on the line. Referee Benoît Millot reached for the red card and Jimmy Briand sent Seydou Sy the wrong way from the spot. Sy, 22, playing because Danijel Subasic hurt his thigh at the Parc des Princes, saved well from Thuram (24') but was powerless when Etienne Didot scored a goal of the season contender (34') as the midfielder produced a sublime volley from outside the box to connect with a Clément Grenier corner.
Thuram, whose father Lilian scored his first Ligue 1 Conforama goal for Monaco back in 1994, added a third (47') after Briand had cleverly let a Nicolas Benezet pass through to him. Thuram, 20, picked out the bottom corner.
Monaco pulled one back through their only attempt on target of the night as full-back Almamy Touré headed home a Thomas Lemar free-kick (63') but Guingamp could and should have scored more as Sy performed heroics to keep out Benezet (67') and then Jonathan Martins-Pereira (68') while the ball struck the post (68') when Jérémy Sorbon went in for the ball with Fabinho.
THE PLAYER: Jimmy Briand
The Guingamp captain's goal took him onto nine for the season and to 28 in his Guingamp top division career, one shy of the club record held by Stéphane Carnot. Briand's penalty was calmly taken and some of his touch play around the box was a delight to behold.
THE STAT: 3
Guingamp have now won their last three home games having not managed a maximum haul in any of their five previous Roudourou outings. The points moved Guingamp to three points back from fifth-placed Rennes.