BBC Sport looks at some of the key storylines as world champions South Africa host Ireland in a highly-anticipated Test match at Loftus Versfeld Stadium in Pretoria.
Ireland will replace South Africa at the top of the world rankings if they win Saturday's Test by more than 15 pointsMuch has changed in the 10 months since Ireland claimed a captivating World Cup win over South Africa on a memorable night inside the Stade de France.
It stung Ireland, and while they defended their Six Nations title earlier this year, it feels as though Andy Farrell's side have travelled to South Africa for a two-Test series with a point to prove. He didn't see Farrell's curve-ball coming, though, with the Englishman handing Jamie Osborne a surprise debut at full-back and keeping Jimmy O'Brien - Erasmus' pick - on the bench.
Erasmus, of course, has an Irishman in his backroom team with 2009 Grand Slam winner Jerry Flannery having been installed as defence coach earlier this year. Ireland's biggest change has come on the pitch. With Johnny Sexton having retired after the World Cup, Jack Crowley has stepped into the No.10 shirt.
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