The New Zealand Conference remains tight in Super Rugby after the Chiefs caught the eye with a big away win.
The Brumbies secured an important bonus-point win against the Sunwolves on Sunday, ensuring they remain in the post-season hunt.
The Lions and the Brumbies both grabbed late victories as a pair of red cards had a big say on two tense Super Rugby clashes.
The Brumbies' cause against the Lions in Super Rugby was not helped by Rory Arnold's red, while the Sharks defeated the Chiefs.
Chance Peni will miss the Brumbies' next four matches following a dangerous tackle on Israel Dagg in Super Rugby on Saturday.
Argentine side the Jaguares had never beaten a New Zealand Super Rugby team before overpowering the Blues in the second half at Eden Park.
Nicolas Sanchez kicked two conversions and a pair of penalties to secure the Jaguares a 25-20 victory over the Brumbies in Super Rugby.
The Rebels led 19-6 in the second period but the Jaguares fought back strongly in the final half an hour to secure a 25-22 Super Rugby win.
The Blues came closing to claiming a long-awaited win over the Chiefs, but a late penalty try denied them at Waikato Stadium.
The Waratahs' 24-17 victory over the Brumbies came at a price as Israel Folau picked up a hamstring injury at Canberra Stadium.