Marek Hamsik scored twice as Napoli took a giant step towards the Europa League semi-finals by beating Wolfsburg 4-1 away.
Wolfsburg returned to within 10 points of Bundesliga leaders Bayern Munich with a 2-0 win in Hamburg.
Wolfsburg all but mathematically secured a Champions League spot with their 3-1 win over Stuttgart.
Robert Lewandowski was the difference in the German Klassiker, while there were wins for Monchengladbach and Leverkusen
Wolfsburg failed to make significant inroads on Bayern Munich at the top of the Bundesliga as they were held by Mainz.
Bayern Munich suffered their first home defeat of the season as Raffael's double secured a 2-0 win for Borussia Moenchengladbach.
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