Argentina's Mateo Carreras scored a hat-trick to help the Los Pumas see off Japan 39-27 in their winner-takes-all Pool D clash on Sunday.
Ireland ended Scotland's Rugby World Cup campaign by beating them 36-14 in Paris to set up a quarter-final rematch with New Zealand.
England were forced to dig deep in an 18-17 victory over Samoa that will have left probable World Cup quarter-final opponents Fiji licking their lips.
New Zealand head coach Ian Foster is sweating over the fitness of star front-row Tyrel Lomax after he sustained another knee injury in their 73-0 victory over Uruguay in Lyon on Thursday.
Fiji beat Georgia 17-12 in their Rugby World Cup clash in Bordeaux on Saturday after fighting their way back from a nine-point deficit.
Springbok head coach Jacques Nienaber has warned fans not to expect Handre Pollard to last the full 80 minutes against Tonga on Sunday.