You can decide who the heroes and villains are in the midweek Champions League semi-final matches by trying out BBC Sport's Player Rater.
It can be used to give players marks out of 10 during the game but it is not only here for the live action.
You can have your say after the final whistle too and see how others have rated the players.
The aggregated scores will be displayed in our live console and updated as more scores come in.
Arsenal v Manchester United (1945 BST)
Chelsea v Barcelona (1945 BST)
Please note: Raters will update with teams approximately 30 minutes before kick-off
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