How to beat 5-1-1-1-2? Cup - Last16

[Wohltat]

Hello,

in the cup I am vs. a very strange formation. The guy usually wins his games with 5:0 and higher. Qualitywise his team is 0.4 better than me.

I check his history in the cup and he lost a game home once 2:3 vs. 4-4-2. But on the other hand he won the game away vs. the same team 6:0. Any suggestion will be highly appreciated. Should I postpone the league game I have 3 hours before the cup game?