Aussies would be hoping to pick a couple of wickets and wrap things up at the earliest. On the other hand, South Africa would want to add some precious runs on the board.
Elgar played a heroic knock and remained unbeaten on 121*.
The 34-year old needs to play a lot more competitive cricket to earn a recall.
Smith is currently preparing for the third Test against South Africa that gets underway on Thursday.
The momentum is with the hosts following their series-levelling victory in Port Elizabeth
Earlier, Rabada was banned for two matches.
The third Test will commence on March 22 in Cape Town.
"Vernon Philander doesn’t bowl fast but when the ball is reverse-swinging he’s still difficult to play."
Good news for South African cricket fans.
There is still uncertainty about the participation of Kagiso Rabada in the final two Tests.