Naas RFC's Andrew Osborne scored a crucial try for Ireland in the 67th minute to extend their lead to 18 points.
Ireland have secured a semi-final place at the World Under-20 Championship in South Africa.
Brian Gleeson and captain Gus McCarthy both scored a pair of tries in a 47-points to 27 win over Fiji in Stellenbosch.
Naas RFC's Andrew Osborne scored a crucial try for Ireland in the 67th minute to extend their lead to 18 points.
Ireland finish top of Pool B as Australia and England drew 22-points apiece.
Unbelievably proud of this team! 💚#FutureIsGreen | @PwCIreland pic.twitter.com/Auuy7Gu5bu
— Irish Rugby (@IrishRugby) July 4, 2023