Onchan surprised Ayre United in the GH Corlett Woods Cup preliminary round.
Craig Marsh, Mark Burman, Gerard Colligon and Mark Rees were on target in a 4-2 home win.
Phil Quayle and Elliot Cureton replied for the Tangerines.
Douglas Athletic are up to fifth in JCK Division Two after an 8-1 thrashing of Braddan.
A Josh Green treble, a Liam Dawson double and further goals from Darren Shields, Andy Newton and Stuart Monks (penalty) secured the three points to lift them above Colby in the table.
Tennis: Billy Harris confirmed for Wimbledon qualifiers
Former Island star to begin campaign next week
Triathlon: Read and Isaac take honours in Manx Middle Distance
Both take impressive wins during meeting in Ramsey
8TEN Racing withdraws from rest of 2026 BSB season
Team says move allows them to return to 'full competitiveness' next year
Football: Long-serving Castletown manager steps down
Garry Sansbury has led club's first team for last 25 years