Unfortunately, you have home disadvantage. McHale is no fortress.
Still, Derry are division 3, and even Brolly says they're a mess. Have Mayo even beaten Derry in the championship?
Might be a half decent game, certainly the best pairing, as the other 3 qualifier games will be paddlings. If it was a sunny morning, I'd be tempted to make the trip up the road to Castlebar. (Disguised in me Ballymun Kickhams Jersey).