The hosts thought they had pulled back a point but in a bitter blow former LOSC player Ludovic Obraniak scored a stoppage-time winner to secure all three points for the visitors
Bordeaux took an early lead through Nicholas Maurice-Belay but were pegged back soon after by David Rozenahl. The visitors then stormed to a three-goal advantage courtesy of strikes from Ludovic Obraniak, Maurice-Belay’s second of the day, and Yoann Gouffran.
From 4-1 down LOSC levelled the game through Eden Hazard, Mathieu Debuchy and Nolan Roux, but former Lille player Obraniak popped up to score his second of the afternoon and steal all three points for the hosts, dealing a major blow to the champions' hopes of defending their title in the process.
The home crowd was stunned within two minutes of kick off, when Obraniak carried the ball down the right flank before cutting onto his left to shoot. His effort was saved by Mickael Landreau but Maurice-Belay fired back at goal and found the net via a Debuchy deflection.
Lille were unperturbed and drew level just six minutes later. Dmitri Payet’s corner was headed at goal by Rozenahl, forcing a top-drawer save as Cedric Carrasso clawed it out of the top corner. Unfortunately for the keeper his parry only went as far as Rozenahl who volleyed in from an acute angle with Carrasso still on the floor.
Debuchy’s nightmare continued when he handed the ball straight to Maurice-Belay in his own half. He found Gouffran in the box and the former Caen forward teed the ball up for Obraniak who fired a low left-footed strike past Landreau from the top of the box.
LOSC continued to dominate possession but they looked vulnerable to the swift breaks of the visitors. The second half brought no respite for the hosts who looked increasingly disjointed.
Maurice-Belay missed a chance just 20 seconds after the restart but he did not fail with his next opportunity in the 50th minute. After showing great strength to turn and squeeze between Benoit Pedretti and Rozenahl he surged into the box. He forced Landreau to commit, allowing the striker to pass straight into the net.
Soon after Gianni Bruno’s awful pass stopped Roux from tapping in, FCGB extended their lead on the hour mark. Another defensive error, this time from Hazard, handed Jaroslav Plasil the ball in the Lille half. He drove to the line, gliding past Rio Mavuba’s weak challenge before cutting the ball back for Gouffran to tap into the net.
Hazard atoned for his error five minutes later when his exquisitely struck free kick screamed into the top corner of the net with Carrasso helpless, and at 4-2, the comeback was on.
Hazard looked inspired and his side pulled another goal back with 15 minutes left to play. Debuchy plucked Mavuba’s ball out of the air and volleyed into the bottom corner with Carrasso rooted to the spot.
It looked as though the comeback was complete when Hazard and Pedretti combined to allow Roux to level the game at 4-4 in the dying moments.
But Bordeaux then silenced the crowd as Obraniak fired in his second of the day from an unmarked position on the left side of the box, and broke the spirit of the defiant champions.
Lille remain in third position but miss the chance to close the gap between themselves and PSG and Montpellier at the summit of the league. Bordeaux meanwhile pull away from the bottom of half of the table after securing a magnificent victory.