Chelsea 1-2 Manchester United
Chelsea is a team consisted of young players now.
They don't have a lot fo experience in knockout games and I think that this fact caused them to lost the game against the Red Devils.
In my opinion it is not a factor that is a reason for losing the match, because Manchester United are a great team that is not easily defeated by Chelsea, even though young players they are still very great, but if it rivals Man. United are still losing.