Welsh trio Andrew Selby, Fred Evans and Zack Davies claimed victories at the European Amateur Championships in Ankara but there was disappointment for Khalid Yafai.
Yafai, a silver medallist last year, headed to Turkey as one of the favourites but was beaten 19-10 by Ireland's Michael Conlon, who produced a superb performance in only his eighth senior fight.
Selby reached the last eight in the same 52kg category as he eased past Norbert Kalucza of Hungary 28-11, while welterweight Evans won his second fight in as many days 13-8 against German Araik Marutjan.
Youngster Davies capped a superb day for Welsh boxers when he beat Dmitry Galagot of Moldova 30-17. Also at lightweight, Scotland's Josh Taylor moved into the last 16 beating Koba Pkhakadze of Georgia on countback.
Ireland's Willie McLaughlin won his second fight 20-14 against Croatian Borna Katalinic to move through at welterweight, but Michael McDonagh lost 16-6 to Valodymyr Matvichuk of Ukraine.