With South Africa and Australia looked at 1-1, history suggests the match, starting Saturday at Newlands, will not be a draw and the series will have a clear winner.
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The Proteas are aiming for their first home series victory against Australia since they were reinstated as a Test-playing nation in 1991.
Mild temperatures are predicted for the match, with the mercury not tipped to exceed 28 degrees, although humidity could be a factor.
Ian Gould (England) and Aleem Dar (Pakistan) will stand as on-field umpires, while Roshan Mahanama is the match referee.
The last time these two sides met at Cape Town was in 2011, when Australia rolled the Proteas for 96 runs in the first innings to take a 188-run lead, before being skittled for just 47 on the way to an eight-wicket loss.
However there is more than a fair chance the pitch presented for the third Test will be a low-bounce track designed to take the sting out of Australia's spearhead Johnson.
Any wonder the Proteas are doing everything they can to blunt Johnson.
In his last 14 innings - against England and South Africa – the left-armer has taken a stunning 52 wickets at an average of 14.71.
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Johnson might be the man of the summer but Steyn is officially the top ranked bowler in the world ripped shreds off the Australian batting order to power South Africa to a 283-run win in Port Elizabeth.
Aside from pace, Steyn possesses the ability to find reverse swing with the old ball – and that currently is Australia's ultimate weakness.
In terms of batting, both teams boast match-winners, although the home team can call on AB DeVilliers and team-mate Hashim Amla – the two top ranked batsmen in the number one Test side in the world.
Both have sturdy Test records in Cape Town - De Villiers has scored 824 runs at 41.2 at the ground, while Amla has scored 827 runs at 41.35.
Australia's trump card with the bat is David Warner.
The fast-scoring left-hander enjoyed a strong Ashes series, scoring 523 runs at an average of 58.1 and has backed that up with 263 runs at 65.75 in the first two Tests in South Africa, reaching 50 in three of his four innings.
Another talking point from the series has been the lack of runs from captains Graeme Smith and Michael Clarke.
Both leaders are short on form - with 37 runs for Smith and 60 for Clarke across four innings each.