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The La Liga champions got off to a quick start, as Lionel Messi pounced onto a loose ball to tap in from close range after just eight minutes.
Sanchez found the target himself later in the first half, before Pedro smashed the ball in from Jordi Albi to make it 4-0 at the break.
Fabregas added his first eight minutes into the second half, clinically rolling the ball in from a Sanchez cross, before picking out the top corner with a curling effort 15 minutes later.
Adriano made it seven with a powerful effort from 35 yards out, before a Jean Marie Dougou tap-in sealed the eighth goal in a dominant display from Barcelona.