Cardiff secured a crucial 8-7 victory over Leinster in challenging conditions at the Arms Park. The hosts led 3-0 at halftime through Callum Sheedy's penalty before extending their advantage with Aled Davies' counter-attack try in the 54th minute. Leinster responded with a converted try by Luke McGrath in the 68th minute but Cardiff held on despite being reduced to 14 men when Jacob Beetham received a yellow card.
This result moves Cardiff into third place in the United Rugby Championship table, level on points with Leinster but with a 15-point buffer over other teams chasing play-off spots.