Imperious Barcelona thumped visitors Borussia Dortmund 4-0 in their Champions League quarter-final first leg on Wednesday after Robert Lewandowski netted twice against his old club to earn the Catalans a sizeable lead ahead of next week's return visit to Germany.

The Polish striker delivered a performance full of fire, finesse, and leadership—netting twice against his former club and pushing his tally to 40 goals for the season and 99 in total for Barcelona.

Barcelona thrashed visitors Borussia Dortmund 4-0 in their Champions League quarterfinal first leg on Wednesday but their manager Hansi Flick was quick to silence suggestions his side had already booked their place in the semifinals. Flick played down Barca's sizeable lead ahead of next week's return visit to Germany.