Samuel Kalu's late effort was not enough to save Bordeaux as goals from Cameroon's Ignatius Ganago and DR Congo's Gael Kakuta steered Lens to a 2-1 win on Saturday.
Both teams struggled to break the deadlock at the Stade Bollaert-Delelis in the first 45 minutes but Ganago opened the scoring for the hosts two minutes into the second half.
The 21-year-old has been in fine form in the Ligue 1 this season, scoring a goal in Lens' last two games which took his tally to three efforts in four Ligue 1 appearances.