Liverpool middleweight Anthony Fowler beat Ukraine's Dmytro Mytrofanov to make the quarter-finals of the World Amateur Championships in Kazakhstan.
Fowler, 22, claimed a unanimous verdict over the second seed, who had stopped Olympic silver medallist Fred Evans in a World Series of Boxing bout in May.
Fowler will now face Germany's Stefan Hartel in the quarter-finals, with the winner of the fight guaranteed a medal.
Hartel beat Fowler in the last 16 of the European Championships in June.
Ireland's reigning European champion Jason Quigley also reached the middleweight quarter-finals with a unanimous victory over Scotland's Aston Brown.
In his debut at bantamweight, Ireland's Olympic bronze medallist Michael Conlan will meet Russia's Vladimir Nikitin in the quarter-finals after a unanimous win over Brian Gonzalez of Mexico.
Irish heavyweight Tommy McCarthy also made it into the last eight with a 3-0 win over Emir Ahmatovic of Germany.