Mitchell Marsh and Usman Khawaja ahead of the final day's play, Australia v South Africa, 1st Test, Perth, 5th day, November 7, 2016© Cricket Australia/Getty Images
The crack on the WACA pitch, Australia v South Africa, 1st Test, Perth, 5th day, November 7, 2016© Getty Images
Kagiso Rabada runs in to bowl, Australia v South Africa, first Test, Perth, day four, November 6, 2016© Getty Images