Chelsea took the lead against Atletico Madrid at Stamford Bridge when Fernando Torres scored against his old club.
Atleti equalised just 8 minutes later when Adrian scored.
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13 minutes into the second half Samuel Eto'o, who was not long on the pitch, fouled Diego Costa in the penalty area.
Costa stepped up eventually, after being given a yellow card, and smashed the ball to the net.
Arda Turan wrapped things up for the Spanish side in the 72nd minute.
