Ulster suffered a hammering in Bloemfontein, where wing Anthony Volmink scored three of nine tries for the Cheetahs.
With victory over Samoa, 2019 tournament hosts Japan have the chance to win the group at a Rugby World Cup for the first time.
Despite securing a quarter-final spot with a game to spare, Eddie Jones wants his players to prepare for a tough game against France.
Samoa were eliminated from the Rugby World Cup as Japan maintained their 100 per cent record and earned a late bonus point.
Adam Coleman and Lukhan Salakai-Loto were sent to the sin bin for high tackles but Michael Cheika did not want to talk about it.
England clinched a place in the knockout stages at the Rugby World Cup, aided by a red card for Argentina's Tomas Lavanini.
Tomas Lavanini was sent off for a high shot on Owen Farrell in the first half as England eased to victory over Pool C rivals Argentina.
Jordan Petaia, 19, capped his long-awaited international bow with a try as Australia claimed a bonus-point win in Pool D.
Leinster's 21-year-old hooker Ronan Kelleher ran in a hat-trick in their thrashing of the Ospreys, while the Scarlets saw held off Glasgow.
Jordie Barrett will demonstrate his versatility by stepping in to take over as fly-half when New Zealand play minnows Namibia.
Lewis Moody says Agustín Creevy's dig over England's style could "fan the flames" for Eddie Jones' side against the Pumas.
Jacques Brunel has stuck with his rotation policy for France's match against Tonga - a fixture that produced a huge World Cup shock in 2011.
South Africa put 14-man Italy to the sword to put one foot in the quarter-finals, but Rassie Erasmus says there was room for improvement.
Ruthless South Africa moved to the top of Pool B by dishing out a seven-try hammering to Italy.
Eddie Jones is looking for England to show they can handle the step up in quality as they prepare to face Argentina and France.
New Zealand lock Brodie Retallick is set to make his return from injury against Namibia.