Flyweight Michael Conlan advanced to the quarter-finals of European Championships in Minsk after defeating Narek Abgaryan on a unanimous points decision.
The judges scored the fight 30-27, 30-27, 30-27 in favour of the Belfast boxer.
Elsewhere, there was disappointment for Irish competitors on Monday as Joe Ward, Ray Moylette and Con Sheehan all lost.
Ward suffered an agonising TKO defeat in Belarus after injuring his knee at the end of the last round.
The light-heavyweight was leading his opponent, Poland's Mateusz Tryc, but fell after two minutes and 40 seconds of the third round.
The Moate boxer was reported to be winning the 81kg fight comfortably before the injury.
Irish physio Conor McCarthy said that Ward had dislocated his left knee cap and they were awaiting the results of an X-ray.
Light-middleweight Ray Moylette lost out to his Turkisk opponent Husseyin Karslioglu on a unanimous verdict - 29-28, 29-28, 29-28.
Con Sheehan's also exited on a split decision against Georgia's Mikheil Bakhtidze 29-28, 29-28, 30-27 in their super-heavyweight clash.
Irish squad 2013 European Championships
49kg – Light-flyweight – Paddy Barnes (Holy Family BC, Belfast)
52kg – Flyweight – Michael Conlan (St John Bosco BC, Belfast) WIN
56kg – Bantamweight – John Joe Nevin (Cavan BC)
60kg – Lightweight – Sean McComb (Holy Trinity BC, Belfast) OUT
64kg – Light-welterweight – Ray Moylette (St Anne’s BC, Mayo) OUT
69kg – Welterweight – Adam Nolan (Bray BC, Co, Wicklow)
75kg – Middleweight – Jason Quigley (Finn Valley BC, Donegal)
81kg – Light –heavyweight – Joe Ward (Moate BC, Co. Westmeath) OUT
91kg – Heavyweight – Tommy McCarthy (Oliver Plunkett BC, Belfast)
91kg+ - Super-heavyweight – Con Sheehan (Clonmel BC, Tipperary) OUT