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Well its the Europa conference league final and if not for anything then for that fact that it's a final I won't look the odd difference to select a winner because if am not mistaken Manchester united had lesser odd against Tottenham and also same goes for the blue half of Manchester on their final match with crystal palace in the FA cup and if I remember correctly all the teams with the bigger odd came out victorious on both occasions.
Of course odds aren't the only thing that help us to select the favourite team in our eyes and it reflects directly or even indirectly the trend of selection of the expected winner by participants.
I agree that sometimes the team with the lowest odds might lose especially in continental and international competitions. However, as I told you Chelsea is way better and both teams to score and two goals at least are something that were easy to wait for.
Few minutes before the end of the game and Chelsea is leading with 4 goals already.