Holders PDMS Southern Nomads set out their stall for the new season with a clinical display at Ballafletcher edging out Vagabonds B 22-5.
Nomads led 12-0 at half-time after tries from Conor Stephens and Harry Brereton, plus a conversion from Will Cain.
Vagas pulled one back early in the second half through Danny Kane but Stephens’ second and a late try from Steve McHugh gave them the win.
At Mooragh Park, Ramsey B recorded a solid 48-3 win over Castletown.
Kiwi Craig Harlick grabbed two for Ramsey as did Andy Wilson. There were also tries from Max Singer, Rory Nicholson, Kevin Granzotto and Ben Harding. Andy Cleator kicked three conversions and Granzotto one.
In the final game of the day, Douglas B steamrollered Emerging Nomads 85-0 at Castle Rushen High School.
Glenn Smith picked up a hat-trick for Douglas, Murray Acheson got a brace and there were single tries from Ben Dutnall, Noel Capewell, Aaron Mason, Tom Anderson, Liam Murphy, Shaun Grobelaar, Adam Howarth and Chris Bollen.