Jaguares 21 (Pablo Matera & Matias Moroni tries; Jaoquin Diaz Bonilla three penalties & conversion) Chiefs 16 (Lachlan Boshier try; Jack Debreczeni conversion & two penalties, Marty McKenzie penalty)
80th minute: Jaguares are hot on attack, looking to seal this match. They're penalised and the Chiefs have one last chance - but they have to go 100 metres.
They clear to about 30 metres and have the lineout feed, but it's untidy. Jaguares drive them back inside the 22.
Lienert-Brown is smothered in a tackle and concedes the penalty. That's the win for the Jaguares - they'll now host a semi-final next week, against either the Brumbies or Sharks.
77th minute: Stevenson tries to break out of defence and reaches the Jaguares half, but he's isolated and penalised for holding the ball in a tackle.
72nd minute: Forwards lay seige on the Jaguares line, but Sowakula spills the ball and it's cleared. Chiefs feed the lineout - but the throw is crooked.
70th minute: Chiefs build good pressure and put together 15 phases under advantage. Parete is eventually smothered in a tackle and Jackson takes them back for the penalty.
Chiefs take a scrum seven metres out.
69th minute: Chiefs win a scrum penalty and kick inside the 22. The ball goes loose from the attacking lineout, but they retain possession.
64th minute: Chiefs mount a promising attack, but Manu is tackled inside the 22 and turns the ball over. Taukei'aho replaces Harris at hooker, but his short lineout throw is too short.
63rd minute: Weber is replaced by Tahuriorangi. Wainui finds a good touch just outside the Jaguares 22.
59th minute: Chiefs are penalised again for offside and Diaz Bonilla adds another three points. that's 13 unanswered points to the Argentinians.
58th minute: Jaguares put kick through towards the goal-line, Stevenson tries to clear, but Manu is dragged into touch, about 10m out.
57th minute: Chiefs are ruled offside, just inside the Jaguares half and Diaz Bonilla finds touch on the 22 for another attacking lineout.
54th minute: Jaguares attack from deep and challenge the Chiefs goal-line. They turn the ball over, but have a penalty advantage for a high tackle.
Diaz Bonilla slots the goal to retake the lead.
51st minute: TRY to Matias Moroni
Jaguares run a play off the attacking lineout. They spin the ball right and then bring it back left, where Moroni has an overlap.
Diaz Bonilla converts.
49th minute: Jaguares earn a penalty in midfield and Diaz Bonilla kicks to the corner.
48th minute: Another huge scrum from the Chiefs earns a midfield penalty. McKenzie has a chance to add points within seconds of entering the game - he is successful.
46th minute: Chiefs have the ball again, but Debreczeni drops the ball in midfield. There are some handbags exchanged.
Debreczeni has hobbled off with a groin injury suffered during that last kick at goal - he's replaced by Marty McKenzie.
42nd minute: From the attacking lineout, Chiefs try to build some continuity, but the Jaguares defence forces them back initially.
Augustin Creevy is ruled offside and Debreczeni slots another goal.
41st minute: Chiefs win a penalty inside their own half. Debreczeni kicks to touch on the 22.
Half-time: Chiefs 10 (Lachlan Boshier try; Jack Debreczeni conversion & penalty) Jaguares 8 (Pablo Matera try; Jaoquin Diaz Bonilla penalty)
40th minute: Jaguares earn a penalty inside their own half and a chance to mount one last attack.
They fail to find touch and Stevenson clears, as the half ends.
39th minute: Jaguares make big ground down the right touch-line and are hot on attack, but Lienert-Brown gets over the ball at the ruck and earns a relieving penalty.
37th minute: From the kick-off, Debreczeni makes a break and finds Weber in support.
But Weber's pass goes loose and the Jaguares clear.
36th minute: Big Chiefs scrum earns a penalty five metres out. Debreczeni slots the points to take the lead.
33rd minute: From the lineout the Chiefs surge towards the goal-line, with Retallick again leading the way. Sowakula makes a halfbreak and finds Boshier on his shoulder, but Sowakula then knocks on from a ruck a couple of metres out.
Jaguares defensive scrum.
31st minute: Jaguares are trying to make ground inside the Chiefs half, but Retallick is quickly over the ruck and earns a penalty for not releasing. Debreczeni kicks to the 22.
30th minute: Glen Jackson is refereeing this game - didn't he play for the Chiefs?
27th minute: TRY to Lachlan Boshier
Debreczeni quickly converts.
Jaguares clear from Retallick's knock-on, but the Chiefs regather at halfway and mount another attack. Ardron is taken off the ball, so they're playing under advantage, but they don't need it.
Weber splits the defence and finds Boshier in support - he crossed between the posts.
26th minute: Chiefs break out of defence and Stevenson puts a long kick downfield. Jaguares clear, but the Chiefs are on the front foot - Retallick drops the ball.
24th minute: Chiefs forwards lay seige on the line, but a pass goes loose from Ardron and the ball is hacked downfield. They just aren't finding any continuity.
22nd minute: Chiefs have the ball in midfield and the Jaguares are ruled offside. Debreczeni finds touch about five metres out.
20th minute: Jaguares are string together several phases in midfield, trying to find a way through the Chiefs defence. They draw their opponents offside and are awarded a penalty out in front.
Bonilla lines up the kick at goal and slots it to extend the lead.
18th minute: Sowakula makes a charge down the left side, but the pass is ruled forward and called back.
15th minute: Cane has the ball and the Chiefs are mauling, but great defence from the Jaguares forwards and they turn the ball over for a defensive scrum.
13th minute: The ball goes right from a lineout win and Stevenson dances down the touchline, diving over in the corner. He put a foot in touch though and the Jaguares clear from the lineout.
12th minute: From a midfield scrum, the Chiefs break from their own half and Weber kicks towards Wainui's wing, finding touch about 10 metres out.
Ninth minute: From the scrum, Jack Debreczeni finds touch near halfway.
Seventh minute: The Chiefs are penalised for obstruction, after the Jaguares put up a high ball. The Argentinians have an attacking lineout inside the Chiefs 22.
From the lineout, the Jaguares surge towards the line, but the ball is knocked on. The Chiefs can't clear though and have a defensive scrum six metres out, near the right touch.
First minute: TRY to Pablo Matera
Whoa, we've barely had time to settle into our seats and the home side have already scored.
The Jaguares kick off, but the Chiefs make a hash of clearing the ball and the hosts capitalise, with Matera driving over from a ruck on the goal-line.
The conversion is missed, but that's an early blow.
*****
Welcome to the build-up to kick-off in Buenos Aires. Looks like a great night for footy.
Looks like Alex Nankivell has overcome his fitness concerns and will take his place in the reserves for the Chiefs.
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Kia ora, good morning and welcome to Newshub's live coverage of the Chiefs' Super Rugby quarter-final match against the Jaguares in Buenos Aires.
The Waikato-based side looked dead and buried early in the season, losing three of their star players along the way, but have rallied down the stretch to sneak into the top eight teams for a playoff spot.
The return of captain Sam Cane from his neck fracture seems to have inspired his team in the past month, as they produced a defensive masterclass against the Reds and then shocked the champion Crusaders in Fiji, before sealing their post-season involvement with a big road win over the Rebels.
While Damian McKenzie remains sidelined for the rest of the year, All Blacks lock Brodie Retallick has also returned from injury and suddenly the Chiefs have found a second wind.
Today, they face a Jagaures side that have been impressive all season, finishing atop a very competitive South African conference for the first time.
While some may complain that they are essentially the Argentinian national side in disguise, that scenario was inevitable once they were admitted to the competition.
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They haven't lost since bowing to the Highlanders in Dunedin on May 11 - that's five wins straight.
Significantly, though, their last home loss was to the Chiefs (30-27) in March.
Join us at 10am for live updates of the Chiefs v Jaguares clash.
Pre-match - Chiefs make one change for Jaguares match
The Chiefs have made just one change to their line-up for their Super Rugby quarter-final against the Jaguares in Buenos Aires on Saturday (NZT).
Chiefs coach Colin Cooper has promoted Tumua Manu to the starting side in place of Alex Nankivell, who is under an injury cloud and will have to pass a fitness test if he is to play at all.
Nankivell sustained a knee injury during last week's 59-8 win over the Melbourne Rebels, and if he is ruled out, Ataata Moeakiola will take his spot on the bench.
All Black Anton Lienert-Brown will shift from centre to second-five to partner Manu in the Chiefs midfield.
The rest of the team is unchanged, with influential leader Sam Cane captaining the team.
The Chiefs head into the match full of confidence, having won their last three games, including a shock 40-27 win over the Crusaders and a nine-try romp over the Rebels.
"As a team, we need to draw on the confidence we have gained from our past couple of games," said Cooper.
"We are not strangers to quarter-finals rugby, we just need to stay focused, and deliver a performance our fans and whanau are proud of.
"There is plenty of energy in the team, especially from our leaders. We know the Jaguares are a quality side.
"They have performed well and we have the utmost respect for them."
The Chiefs hold the head-to-head advantage over the Jaguares, beating them twice in their three previous meetings, including a 30-27 triumph earlier this season in Argentina.
More to come