Commonwealth Games gold medallist Eamonn O'Kane started his professional career with a first-round knock-out win over Dimitrijus Kalinovskis.
The Lithuanian was a late replacement for the planned opponent for the Cardiff contest, Joe Jones of Wales.
Super bantamweight Carl Frampton from Belfast had a much tougher battle with Robbie Turley in a Celtic title fight and British eliminator.
Frampton suffered a cut but won on all three judges' cards.
Turley was floored in the seventh round but produced a brave display against Frampton who is managed by Barry McGuigan.
Gavin Rees of Wales took the vacant European lightweight title with a unanimous points win over unbeaten Irishman Andrew Murray in the top fight in Wales.
Despite conceding a height advantage, the former WBA world light-welterweight champion began strongly at Cardiff's Motorpoint Arena.
Rees, 31, gained a comfortable lead before tiring dramatically in the second half of the fight.
But he still won easily, the judges scoring it 115-112, 115-112, 116-112.