South Africa won by 54 points as they dominated Namibia. They secured the bonus point halfway through the first half and they just kept on increasing the lead in the second.
The only points for Namibia came from a penalty in the first half.
South Africa scored nine tries, five in the first half and four in the second. Hooker Bongi Mbonambi and winger Makazole Mapimpi had a pair each.
Namibia has never won a Rugby World Cup game and the gulf between the teams was clear and big despite them being southern African neighbors.
FULL-TIME: South Africa 57-3 Namibia.
Springboks – Tries: Bongi Mbonambi (2), Makazole Mapimpi (2), Francois Louw, Lukhanyo Am, Warrick Gelant, Siya Kolisi, Schalk Brits. Conversions: Elton Jantjies (6).
Namibia – Penalty: Cliven Loubser.
While Rugby World Cup hosts Japan produced the shock of the tournament as they stunned the world No 2 side Ireland 19-12 to set the tournament alight.
Japan – Try: Kenki Fukuoka. Conversion: Yu Tamura. Penalties: Tamura (4).
Ireland – Tries: Garry Ringrose, Rob Kearney. Conversion: Jack Carty.