South Africa-Australia set for classic finale – what does history suggest could happen?

None of those late runs were made under the pressure of a chase, however.

The wicket of Simon Harmer in the final session, bowled shouldering arms by a ball from Nathan Lyon which turned back sharply showed the difficulty ahead.

Harmer dismissed Travis Head, Marnus Labuschagne, Josh Inglis and Alex Carey in Australia's first innings - all recognised batters.

The 37-year-old Essex legend, who once considered playing for England, will be crucial.

As ever in such scenarios, the pitch will play its part.

The PitchViz rating - CricViz's way of assessing the difficulty of a surface - jumped to 6.6 in the final session, comfortably the highest (thus most difficult) rating of the Test.