Ousmane Dembele scored twice as Paris Saint-Germain warmed up for the second leg of their Champions League last-16 tie against Liverpool by winning 4-1 away to Rennes in Ligue 1 with a much-changed team on Saturday. Bradley Barcola and Goncalo Ramos had PSG 2-0 up in Brittany before Lilian Brassier pulled one back for Rennes,