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PSG are too fearful when playing with big clubs in Champions League and in knock out matches. For many years, they spent a lot of money but lacked of champion mentality and this is biggest barrier for them to succeed in Champions League. A champion must be very confident about themselves and have very strong mentality to maintain advantage they have or to make strong comeback in disadvantageous time.
For the match with Liverpool, again PSG will play it with mass fear, I believe they will not have too opposite mentality in this match. This is big minus for them to get a good result from this match and result will likely not too good for them.
I may not agree with you to some extent, PSG are very good side and this champions league season has brought out the best in them so far, I saw a great mentality of winning in them when playing against Manchester City and other big boys during the group stages. I am having a confident seeing the both clubs playing a very competitive game with equal ball possession in tonight match.
PSG at home ground would be an added advantage though because most games played at home had always been a success to them plus a home supportive voice from the fans too is precious to them. Let's see the outcome tonight.