Jeremy Menez, Zlatan Ibrahimovic and Clement Chantome were the goalscorers for the Parisians.
They are now nine points clear of Marseille, who beat Brest 1-0 at the weekend.
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Chelsea have struggled to build momentum in the opening stages of the campaign and are currently looking over their shoulders at the relegation zone.
Who of Europe’s top strikers will move to England this summer?