Ireland lacked fluency in an unconvincing win over Russia, but responded to their loss to Japan by claiming maximum points.
Jacques Brunel has tinkered with his half-back pairing again for the match against Tonga, Baptiste Serin and Romain Ntamack starting.
Mario Ledesma found no place for experienced fly-half Nicolas Sanchez in the Argentina squad for the showdown with England.
England are boosted by the return of fit-again duo Jack Nowell and Mako Vunipola when they attempt to make it three wins out of three.
Fiji were a class above as they claimed their first win at the 2019 Rugby World Cup on Thursday.
South Africa's powerful pack will be expected to lay the foundations when the Springboks face Italy in a crunch World Cup clash.
The experience of team-mates Dane Haylett-Petty and Kurtley Beale can help out Australia debutant Jordan Petaia, Michael Cheika said.
New Zealand blew Canada away with a ruthless performance, scoring four tries in nine minutes at the start of the second half.
Nine-try New Zealand put Canada to the sword with a ruthless display, showing no mercy in Oita.
France made hard work of beating the United States in Fukuoka and Bernard Le Roux accepted they were complacent in the first half.