Ulster 37 Cardiff Blues 13
Ruan Pienaar scored 22 points as Ulster secured top-spot in the RaboDirect Pro12 with a 37-13 triumph over the Cardiff Blues.
The Blues had gone into the break 13-10 ahead through Dafydd Hewitt's try and eight points from the boot of Rhys Patchell.
But a superb individual performance from Pienaar saw the Irish Province emerge as comfortable victors.
After scoring all of their points in the first half - including a try - the fly-half converted Andrew Trimble's two second period efforts as well as Robbie Diack's score.
The South African also kicked two penalties after the break to complete a fine display and seal a home semi-final with the Scarlets.
Despite having nothing to play for, it was the visitors who took the lead just four minutes into the game when Lewis Jones made a break and Hewitt was on his shoulder to finish under the posts.
Patchell added the conversion to give them a shock 7-0 advantage. However, that was almost immediately wiped out through Pienaar's opportunist try.
Cardiff continued to show plenty of enterprise with young back-rowers Luke Hamilton and Josh Navidi particularly impressive.
Their endeavour was rewarded though Patchell's penalty before the hosts again levelled via the boot of their stand-off.
But a drop-goal from the Blues' pivot took the score to 13-10 in the Welsh side's favour going into the interval
The Irish province started the second period with renewed vigour and duly piled the pressure on the visiting rearguard.
Trimble went over early in the half and Pienaar kicked successive three-pointers as Ulster went 23-13 ahead.
With Mark Anscombe's men now fully in command, their right winger touched down for his second try to complete a remarkable passage of play.
Although the hosts continued to press, it wasn't until the final moments when they broke through the Cardiff defence again through Diack.