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I never thought to be this easy for PSG in this game especially after a couple of bad results for them but in fact it would have been easy if we were careful to see that Marseille had a single win and all draws as they don't have a single lost game yet the fact that they have kept drawing most of their games was a red flag for them as when they will be playing against a big team like PSG they would suffer with such performances.
This game will serve to both teams,more to Marseille which will tell them that you can't go very far in the league if you keep drawing here and there against average teams and lose against big ones and for PSG to improve their winning mindset as this is another victory right after they beat Dortmund in Champions League.
After losing at home against Nice previously, I also don't think this match will be an easy game for PSG. Marseille is a big team in this league, in fact they are the one of PSG strongest competitor in the previous few seasons, but this result proves that Marseille performance was really bad, they lost with a score of 4-0.
You are right, this result will serve to both teams. PSG will be more confident, meanwhile Marseille will probably improve their performance in next match.
Next week PSG have easy game, they will play against clermont and that match will be an advantage for PSG to collect full points again. But in my opinion maybe Enrique won't be too serious about pushing his players to get satisfactory results with a lot of goals, because after that PSG have important game against Newcastle in Champions League.