An unstoppable Kylian Mbappe hit a hat-trick as Paris Saint-Germain romped to a 6-2 win away to Montpellier on Sunday that allowed them to open up a huge 12-point lead at the top of Ligue 1.A 1-1 draw for nearest challengers Brest against Lille earlier on Sunday means the Parisians are now 12 points ahead at the Ligue 1 summit with only eight games left, and a 10th title in 12 seasons is an inevitability.