For the ninth successive match the Hurricanes came out on top as they beat the Blues to go back to the Super Rugby summit.
Racing 92, Lyon and Castres got the play-off outcomes they were hoping for in Top 14, while Stade Francais stay up despite suffering defeat.
The Pro14 semi-final line-up is complete, with Scarlets to play Glasgow Warriors, while Munster take on Leinster.
The Stormers came from behind to edge past the Bulls in the Super Rugby, while the Sharks crushed the Highlanders.
Newcastle Falcons will settle for fourth place and a clash with Exeter Chiefs in the play-offs after they were beaten at home by Wasps.
The Hurricanes enjoyed a 28-19 Super Rugby win against the Lions, with Ben Lam scoring a hat-trick of tries.
A penalty try and a Ramiro Moyano score proved to be the difference as the Jaguares upset the Chiefs in Rotorua on Friday.
Racing 92's bonus-point win over Bordeaux-Begles gives them the slenderest of advantages over Toulouse with one match to play.
Wasps will face either Exeter Chiefs or Saracens in a Premiership semi-final after overcoming Northampton Saints to leapfrog Newcastle.
Rory Best scored two tries but Ulster's bid to overtake Edinburgh came to an end with a 24-24 draw away to Munster.
Toulon moved up to second in the Top 14 table with victory over Castres, but no one can now catch leaders Montpellier.
The Bulls looked set to record a fourth successive Super Rugby win, only to be denied by the last action of the game at...
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London Irish will make an immediate return to the Championship after Worcester Warriors eased to a crushing victory of Harlequins.
Argentine side the Jaguares had never beaten a New Zealand Super Rugby team before overpowering the Blues in the second half at Eden Park.
Leicester Tigers were unable to hold on to a win over Newcastle Falcons with 14 men, leaving their Premiership semi-final hopes in tatters.
JJ Engelbrecht scored two tries and Damian Willemse proved damaging with the boot as Stormers proved too strong for Melbourne Rebels.