Tommy McCarthy ground his way into the last 32 of the World Championships in Almaty, Kazakhstan yesterday.
Belfast heavyweight McCarthy, the first of the Irish squad in action, secured a unanimous decision over Bulgarian Nikolay Mutavski.
The Oliver Plunkett ABC man will now meet Canada's Samir El-Mais in the last 32 on Friday.
Fellow Belfast man Sean McComb will be hoping to join McCarthy in the last 32 when he enters the ring today.
Lightweight McComb will tangle with Israel's Almog Briga, while Ray Moylette faces Alexandros Tsanikidis of Greece at light-welterweight.
London flyweight Charlie Edwards got Britain off to a good start with a unanimous preliminary round win over Nigeria's Olayinka Yusuff.
Edwards, hoping to make up for the heartbreak of missing out on the London Olympics, dominated the bout, wobbling his opponent in the second round and flooring him in the third on his way to victory.
But there was disappointment for Edwards' team-mate Warren Baister who suffered a tough 3-0 loss to Russia's Evgeny Tischenko, while Scotland flyweight Stephen Lavelle also lost 3-0 to Miguel Correa of Chile.