The Portlaoise star overcame talented Lithuanian Vytautas Balsys in the last eight in St Petersburg to make sure that he will be coming home with at least a bronze.
Balsys won European Youth silver earlier in the yea, but it was Nevin who provided the better work this morning
Following a close and technical opening round, Nevin stepped up the pace to compehensively take the second, before a final charge from the Baltic opponent.
Nevin was awarded the bout on a split decision.
The Laois boxer now faces a semi final on Friday where he will look to upgrade to at least a silver medal.
There was disappointment however for Bracken light heavyweight Christopher O’Reilly who was defeated in his semi final by Kazakh Bekzad Nurdauletov.