Brazilian Douglas Costa doubled their lead three minutes minute later , finishing off a quick break .
Lewandowski perfectly converted a sweet cross from Arjen Robben 10 minutes after the restart for his 21st league goal of the season .
Brazilian Douglas Costa doubled their lead three minutes minute later , finishing off a quick break and Lewandowski perfectly converted a sweet cross from Arjen Robben 10 minutes after the restart for his 21st league goal of the season .