Confirmation that PSG had secured the Ligue 1 championship came through just before they kicked off their match as it emerged that nearest challengers Monaco had been held to a 1-1 draw by Guingamp, and news of the result in the principality was met with jubilation by Paris fans. The result left second-placed Monaco seven points behind PSG with only two matches of the season remaining and means that Claudio Ranieri's side will have to settle for the runners-up spot and automatic Champions League qualification.
Monaco took the lead against Guingamp in the 77th minute courtesy of a strike from the in-form Dimitar Berbatov, his fifth in his last four games. However, Fatih Atik equalised for the Bretons five minutes from the end, and PSG fans cheered as it filtered through to them that Monaco had been pegged back.
Guingamp, who won the Coupe de France by beating Rennes 2-0 in the final at the weekend, hung on for a precious draw in their fight against relegation despite having Moustapha Diallo sent off. PSG appeared buoyant at the start of their match and took the lead inside three minutes when Edinson Cavani found Ezequiel Lavezzi, who drilled home.
However, Rennes recovered to equalise midway through the first half, on-loan Marseille winger Foued Kadir firing into the net through a crowd of bodies in the PSG box. Paul-Georges Ntep set up that goal, and four minutes later the France under-21 forward put Rennes in front, his free-kick from wide on the left avoiding everyone in the box as it sailed into the net at the far post.
That proved to be the end of the scoring, with the home side unable to conjure an equaliser even after the introduction of Zlatan Ibrahimovic just before the hour mark, the Swede making his first appearance in a month after a thigh injury.
Remarkably, it was PSG's first home league defeat in 30 matches since a nine-man Rennes side also won 2-1 at the Parc des Princes in November 2012, and the result leaves Rennes safe from the threat of relegation.