Douglas B won the big match in the Shimmin Wilson Manx Shield on Saturday.
They triumphed 28-19 at Vagabonds B in the first of their battles.
They face each other again in a fortnight.
The fast-improving Emerging Nomads saw off Castletown 36-20.
Jimmy Cubbon (two), Gareth Walt, Nick Morby, Dave Horan and Gerrard Landells grabbed the Nomads tries.
Dave Edge (two) and Pat Gandy added conversions.
For Castletown, Billy Harban and Barry Irvine notched tries with Sam Peel kicking two conversions and two penalties.
FC Isle of Man and AFC Liverpool to meet in vital hunt for points
Hockey: Cup finals double-header on the cards
Rugby: Douglas to host Sandbach in big top-of-the-table clash
Football: Prem title contenders Corinthians and Peel to meet
Manx road racers open up about the importance of talking therapies