One team beat the back-to-back premiers by 52 points last weekend, the other lost by 30 to a team that wasn't good enough to make the finals.
Newcastle - the side entering Sunday's elimination final at ANZ Stadium wanting to forget Round 20 - will be hoping their first finals appearance since 2013 lasts for more than one week.
South Sydney can't be expected to repeat the brilliance they displayed last weekend, but even 80 per cent of that might be enough for Wayne Bennett's side to advance to week two of the finals.
Cody Walker enjoyed arguably the best performance of his career in Round 20. The Knights should consider themselves warned.
Match: Rabbitohs v Knights
Finals Week 1 -
Venue: ANZ Stadium, Sydney
Rabbitohs: Liam Knight will start the match in jersey No.15 with Jaydn Su'A dropping back to the bench. Apart from that, South Sydney are 1-17 after Hame Sele and Patrick Mago were the two players left out an hour before the match.
Steven Marsters and Troy Dargan were omitted from the squad 24 hours before kick-off. The Rabbitohs have won their past four finals games at ANZ Stadium.
Knights: Mason Lino is out of the Newcastle team, with Kurt Mann moving from hooker to five-eighth and Chris Randall (No.14) from the bench to the hooking role.
Herman Ese'ese moves from the bench to start at lock, with Aidan Guerra dropping back to the bench.
Tex Hoy will come off the interchange bench after Josh King joined Lino as the last two players omitted from the squad.
Gehamat Shibasaki and Brodie Jones were trimmed from the reserves list on Saturday. The Knights have conceded 140 points in their past four away games.
Fullback for Rabbitohs is number 1 Corey AllanFullback for Knights is number 1 Kalyn Ponga
Winger for Rabbitohs is number 2 Alex JohnstonWinger for Knights is number 2 Edrick Lee
Centre for Rabbitohs is number 3 Campbell GrahamCentre for Knights is number 3 Enari Tuala
Centre for Rabbitohs is number 4 Dane GagaiCentre for Knights is number 4 Bradman Best
Winger for Rabbitohs is number 5 Jaxson PauloWinger for Knights is number 5 Hymel Hunt
Five-Eighth for Rabbitohs is number 6 Cody WalkerFive-Eighth for Knights is number 9 Kurt Mann
Halfback for Rabbitohs is number 7 Adam ReynoldsHalfback for Knights is number 7 Mitchell Pearce
Prop for Rabbitohs is number 8 Tevita TatolaProp for Knights is number 8 David Klemmer
Hooker for Rabbitohs is number 9 Damien CookHooker for Knights is number 14 Chris Randall
Prop for Rabbitohs is number 10 Thomas BurgessProp for Knights is number 10 Daniel Saifiti
2nd Row for Rabbitohs is number 12 Bayley Sironen2nd Row for Knights is number 11 Lachlan Fitzgibbon
2nd Row for Rabbitohs is number 15 Liam Knight2nd Row for Knights is number 13 Mitchell Barnett
Lock for Rabbitohs is number 13 Cameron MurrayLock for Knights is number 16 Herman Ese'ese
Interchange for Rabbitohs is number 11 Jaydn Su'AInterchange for Knights is number 12 Aidan Guerra
Interchange for Rabbitohs is number 14 Mark NichollsInterchange for Knights is number 15 Jacob Saifiti
Interchange for Rabbitohs is number 16 Jed CartwrightInterchange for Knights is number 17 Sione Mata'utia
Interchange for Rabbitohs is number 17 Keaon KoloamatangiInterchange for Knights is number 20 Tex Hoy
- Referee: Ben Cummins
- Touch Judge: Chris Sutton
- Touch Judge: Belinda Sharpe
- Senior Review Official: Jared Maxwell
Kalyn Ponga v Corey Allan: You'd think Ponga needs to produce something special for the Knights to win. If his pack is able to get the upper hand, the prodigious talent he has will have a chance to shine.
As for Allan, he is growing into the role that opened up when Latrell Mitchell injured his hamstring in fine style.
Alex Johnston didn't let spending most of the season looking for another club for 2021, before an 11th-hour change resulted in him re-signing, affect his play. He finished the year as the leading try scorer and with the most line breaks and intercepts.