Not since 2019 have South Africa held the Rugby Championship title, but Saturday could be the day as they head to Argentina knowing victory will seal their fifth crown.
Rassie Erasmus' Springboks have been perfect in the competition thus far, making it four wins from four games with their 18-12 victory over New Zealand two weeks ago.
Standing in their way, though, are a Pumas side that have enjoyed a terrific campaign, handing Australia the heaviest defeat in their storied Test history last time out.
The Wallabies will be desperate to respond in matchweek five's other contest, and a victory over the All Blacks would help them off the bottom of the standings after a difficult campaign.
Ahead of the penultimate round of fixtures, we dive into the best Opta facts and figures to preview both games.
AUSTRALIA V NEW ZEALAND
Australia were utterly humiliated by Argentina last time out, the game running away from them in the second half as they succumbed to a record-breaking 67-27 defeat, having earlier led by 17 points.
Joe Schmidt's team are up against it as they bid to bounce back this weekend. The Wallabies have only won one of their last 12 Tests against New Zealand, drawing one and losing 10.
The All Blacks have won each of the last seven meetings between the teams by an average margin of 17.4 points per game. The last time they enjoyed a longer winning run against their neighbours was a 10-match span between August 2008 and September 2010.
They also boast a tremendous record in Sydney, where this week's contest takes place. New Zealand have only lost one of their last 10 Tests against Australia in the city, winning the last four while averaging 44.3 points per game.
Australia have themselves, however, won their last two Tests in Sydney, as many victories as they managed in their 15 games in the city prior to that span (two wins, one draw, 12 defeats).
And New Zealand have not exactly been faultless on their travels lately, losing three of their last four Tests on foreign soil, including their last two – both in South Africa in this year's Rugby Championship.
If the All Blacks are to halt their miserable run on the road, their ability to create turnovers could be key.
Their 23 turnovers won in the 2024 Rugby Championship are more than any other team, while their four tries scored from turnovers won are second only to Argentina's five.
PLAYERS TO WATCH
Australia – Marika Koroibete
Koroibete has made four line breaks in this year's Rugby Championship tournament, the joint-most of any player this campaign (also Beauden Barrett, with four for New Zealand).
He has recorded at least one in each of his three games in the tournament, after making only two line breaks across his six Test matches before this year's competition began.
New Zealand – Damian McKenzie
McKenzie has made 10 break assists in the Rugby Championship this year, at least four more than any other player in the tournament.
In addition, he has been directly involved in a try on each of his last three starting appearances in Tests against Australia (one try, two try assists) – will he haunt the Wallabies again here?
ARGENTINA V SOUTH AFRICA
South Africa have dominated from the off in this year's edition of the Rugby Championship, scoring 112 points but, most impressively, allowing their opponents just 58 through their four outings to date.
Another victory on Saturday would take them second in the outright charts for most Tri-Nations/Rugby Championship titles, ahead of Australia but behind New Zealand (20).
It would also bring up their outright longest winning run in the history of the Rugby Championship, at six games. History is on their side in Santiago, with the Springboks having won their last eight Tests against Argentina by an average margin of 15.4 points per game.
They were given a scare when the teams last met in August 2023, though, trailing 10-3 at half-time before rallying to secure a 24-13 victory.
Los Pumas may need something incredible to overhaul South Africa in the standings from here, but they will be on a real high following their thumping win over Australia.
Of the last six occasions where Argentina have scored 50 or more points in a Test, they have followed up with a victory four times, including in their last two such matches.
Felipe Contepomi's team have scored a half-century of points twice in 2024, last doing so on three occasions back in 2015.
They will not expect a repeat against South Africa's fearsome defence, but they could trouble the visitors with their physicality.
Los Pumas have scored three tries when starting their possession from a scrum in this year's Rugby Championship, as many as all the other teams combined (South Africa two, New Zealand one).
South Africa, meanwhile, have made a habit of praying on their opponent's mistakes, making 11 kicks in play that resulted in an opposition error, more than twice as many as Argentina, who are second by that metric with five.
The Springboks have also retained possession from 26 in-play kicks, at least 15 more than any other team in the competition, with Argentina and New Zealand logging 11 apiece and Australia recording eight.
PLAYERS TO WATCH
Argentina – Tomas Albornoz
Albornoz has gained 98.4 metres per 80 minutes from his 152 minutes played in the Rugby Championship this year – the most of any player in the campaign.
South Africa – Ruan Nortje
Nortje (26 – including two steals) and team-mate Eben Etzebeth (21, one steal) have won more lineouts (including steals) than any other players in the Rugby Championship this year.
Springboks aiming to have 'two best teams in the world', says Esterhuizen
South Africa centre Andre Esterhuizen said that the Springboks are aiming to have "the two best teams in the world" ahead of their Autumn Nations Series clash against England.
The world champions were pushed all the way by Scotland in their narrow victory at Murrayfield on Sunday, though head coach Rassie Erasmus opted to rotate some key starting positions.
South Africa captain Siya Kolisi and flanker Pieter-Steph du Toit started on the bench, with the changes a common theme during Erasmus' seven-year tenure.
Their opening Autumn Nations Series victory also put them back on top of the world rankings after Ireland's first defeat in 19 home games by New Zealand on Friday.
"One of the good things is that everyone is getting game time now," Esterhuizen told the BBC's Rugby Union Weekly podcast.
"It is also about looking forward, you've got to be able to spare all the guys for the next World Cup and build experience into it.
"The aim is to have the two best teams in the world, all in one squad.
"We want to make it second nature for people slotting in, so if someone steps in, they can just slot in and play the same if not better than the other player."
South Africa next face England, who are yet to pick up a win this autumn, at Twickenham on Saturday.
Steve Borthwick's side suffered a narrow two-point defeat by New Zealand, before conceding an injury-time winning try to Australia on Saturday.
England have now lost each of their last four Test matches, their longest such run since losing five straight games in 2018, but Esterhuizen's former Harlequins team-mate Marcus Smith has been impressive for the Red Roses.
"It's a great space, I obviously love to play there," Esterhuizen added. "It will be great to be running at Marcus, not run off him.
"It's going to be a great match, England have played well in the last few games, it's unfortunate that it hasn't been the results that they want. I think it's going to be a big one."
The Springboks have won three of their last four matches against England (L1), including each of their last two. Three of the last five games between England and South Africa have been decided by single-point margins.
Ireland ready to respond after 'honest' New Zealand chat, says Hansen
Mack Hansen has backed Ireland to bounce back from their 23-13 defeat to New Zealand that saw their 19-game home winning streak come to an end.
The loss also saw Ireland tumble from atop the world rankings to third as the All Blacks repeated their World Cup quarter-final success from last year, and also marked New Zealand's first win on Irish soil since 2016.
Ireland had previously won 25 of their 26 home games under Andy Farrell, which was their longest run on home soil, with their latest defeat before last Friday coming against France in 2021 (13-15).
While questions have been asked of a team that have been beaten in three of their past five matches, Hansen was adamant that the mood is not dampened ahead of Friday’s visit of Argentina.
"People are always very eager to jump on you when you’re down. It’s like in South Africa, nobody gave them a hope after the first Test," said Hansen.
“And what happens? They come back and win it. That’s the best thing about this group. The outside noise is outside noise and nobody knows what goes on in here, how hard we work and how resilient we are.
"People can chat away. The people who know us know, unfortunately, it was one of those weeks [against New Zealand], but we’re ready to bounce back.”
Ireland's display was littered with errors against the All Blacks, which included 21 handling mistakes, 30 missed tackles and 13 penalties conceded at the Aviva Stadium.
But eradicating those mistakes could prove difficult when they face Argentina on Friday, who come into the encounter on the back of a 50-18 thrashing of Italy.
Ireland, however, have not lost to the Pumas since the 2015 World Cup quarter-final and have beaten them on the three subsequent occasions they have played in Dublin.
And Hansen is confident his team-mates can respond against Felipe Contepomi's side and continue their impressive run against Argentina.
“There weren’t really hard chats, just honest chats,” added Hansen on Monday's debrief.
"We came to the conclusion that it wasn’t good enough and also that it just wasn’t us.
"So this week we’re looking to right a lot of wrongs and no better place to do it then back in the Aviva in front of a home crowd."
'Brutal' Australia review exactly what England needed, says Sleightholme
Ollie Sleightholme described England's review of their late defeat to Australia as "brutal", but insisted it was exactly what the squad needed.
England had led by 12 points and then trailed by 10 in an end-to-end encounter, but Maro Itoje's 78th-minute try seemed to have settled matters by moving the hosts 37-35 ahead.
However, in the final play of the match, Len Ikitau found space and fed replacement wing Max Jorgensen, who settled the contest.
The result saw the Wallabies defeat England at the Allianz Stadium for the first time since the pool stages of the 2015 Rugby World Cup when they won 33-13, with their tally of 42 points the most they had scored away to the Red Roses.
The result was their second narrow defeat in the Autumn Nations Series after the two-point loss to New Zealand, and their fourth defeat in a row.
Sleightholme came on as a replacement and scored twice in the second half to register his first two international tries, but provided insight into what followed after the loss.
"It has been really good to chew the fat on what happened and really get a grasp of what we need to do and what needs to change," Sleightholme told BBC Sport.
"It was a brutal view and it needs to be. It was a case of getting it all out there and not shying away from any of it.
"At the end of the day we didn't get it done. It is a frustrating review and a frustrating game to look back on.
"We left some opportunities out there and we didn't nullify some of their attacks. There are a few things [to work on] in all areas."
Saturday marked the first time England have lost four Test matches in a row since 2018, when they suffered five straight defeats under Eddie Jones.
It is the fourth game in five matches that Steve Borthwick's side have fallen on the wrong side of the result during the final play.
It followed two close Tests against the All Blacks in July and a 33-31 defeat by France in their final game of this year's Six Nations.
On Saturday, England will face world champions South Africa, who defeated Scotland in their opening match of the autumn series on Sunday.
"We're testing fans' patience, testing our patience," said England's Ben Earl. "It feels like we won the game twice against Australia and then managed to lose it. Frustrating.
"Not the same old problems, different problems, but the same overwhelming feeling of another game that we've let slip. So food for thought."
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