The Crusaders won the battle of Super Rugby's leading teams, while the Rebels' wingers shared five tries against the Sunwolves.
The departing Dan Biggar became the leading Pro14 points scorer but he was unable to stop UIster sealing a Champions Cup place.
Nicolas Sanchez led the way as the Jaguares celebrated their seventh win of the season – matching a franchise record.
The Brumbies' cause against the Lions in Super Rugby was not helped by Rory Arnold's red, while the Sharks defeated the Chiefs.
Castres are set for a semi-final showdown with Racing 92.
Joe Simmonds kicked 19 points as defending Premiership champions Exeter Chiefs set up a Twickenham showdown with Saracens for the title.
Munster came within striking distance of upsetting European champions Leinster, but the hosts hung on to reach the Pro14 final.
Owen Farrell was successful with all 11 strikes from the tee as Saracens returned to the Premiership final with a ruthless display.
Waratahs full-back Israel Folau reached the 50-try mark in Super Rugby in a long-awaited Australian win over New Zealand opposition.
A thrilling extra-time draw with Toulon saw Lyon progress to the semi-finals of the Top 14.
Glasgow Warriors failed to make the most of home advantage as Scarlets moved one win away from retaining their league title.
The Reds showed a vast improvement, but came up short against the high-flying Hurricanes in Super Rugby.
An entertaining day in Super Rugby concluded with victories for both the Chiefs and the Bulls as they look to sneak into the play-offs.
Just as they did in 2009, 2011 and 2012, Leinster tasted European Champions Cup glory as Racing 92's stern resistance proved in vain.
The Waratahs raced into a 29-0 lead in the first half, but were unable to hold on as the Crusaders came storming back to...
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Cardiff Blues won the European Rugby Challenge Cup for the second time with a 31-30 victory over Gloucester.