Barcelona take a commanding 3-1 aggregate lead into their UEFA Champions League second-leg tie against Bayer Leverkusen at Camp Nou on Wednesday evening.
Barca were particularly impressive at the Bay Arena three weeks ago and were superior to their German opponents in every department.
Leverkusen manager Robin Dutt knows that he faces a tough task to help his team progress. If they are to force an upset, every member of the starting 11 will have to put in a serious shift.
Here I take a look at six key battles that could have a major impact on the fixture.