Leinster took an early lead in Wales when they responded to a Dan Biggar penalty to go up 3-7 thanks to the boot of Jonny Sexton.
Credit of course must go to Dave Kearney for the finish, but Sexton made this try with two inch-perfect crossfield kicks in the space of two minutes.
The first kick allowed Isa Nacewa to relieve pressure and move the play into the Ospreys 22, and a poor clearance kick gave Leinster a great attacking position. Sexton utilised that position to drop a lovely ball over the top of the defensive line straight into the waiting arms of Kearney who did well to go over for the score.
Delightful play from Jonny.
Further kicks from both Biggar and Sexton meant the score at half-time was 6-10 in favour of Leo Cullen's men, with Kearney's try the undoubted highlight of the action at that point. In the end Leinster ran out 22-9 winners, going top of the Pro 12 in the process.