Argentina gave up a half-time lead to lose to South Africa in Durban, but Rassie Erasmus knows his Springboks side must raise their game.
New Zealand and Australia suffered casualties in Sydney on Saturday that will force changes in the second Bledisloe Cup Test next weekend.
The daunting task of competing in a pool featuring New Zealand, South Africa and Italy is Namibia's reward for reaching the Rugby World Cup.
Argentina threatened a shock in the first half in Durban on Saturday, but South Africa eventually hit their stride and cantered to victory.
New Zealand turned on the style in the second half in Sydney after the Wallabies had defended superbly to lead at the break.
The Wallabies held their own against the All Blacks for 40 minutes, but Michael Cheika and Michael Hooper were frustrated by what came next.
Steve Hansen felt New Zealand experienced "a different type of explosion" in the Bledisloe Cup opener in Sydney.
The RFU's decision to charge Danny Cipriani with "conduct prejudicial to the interests of the game" has not gone down well with Gloucester.
The RFU has charged Danny Cipriani with "conduct prejudicial to the interests of the game" following his common assault conviction.
A period of reflection has allowed Danny Cipriani to acknowledge he cannot afford further misdemeanours that may affect his career.
Wallabies skipper Michael Hooper is fired up to face New Zealand in the opening Bledisloe Cup encounter of 2018.
New Zealand are favourites against Australia, but Kieran Read remains wary of the Wallabies.
Reflecting on the Danny Cipriani controversy, Steve Diamond said: "When you employ a rugby player you know you are not employing the Pope."
A look at the four teams who will contest the Rugby Championship - New Zealand, Australia, South Africa and Argentina.
We take a look at the stats behind the opening round of fixtures of the 2018 Rugby Championship, as Australia take on New Zealand.
After being fined for common assault and resisting arrest, Gloucester and England fly-half Danny Cipriani published an apology on Twitter.