Given that he hasn't used anyone for the 8th yet...yeah it likely wont be Romano, my bet would be Cimber or Merryweather.
Mayza isn't bad against RHB, but he is worse than he is against lefties, so I don't think having him face their best hitters who are all RH power guys would be the right call. I'm fine with him using Mayza in the 7th.