The inaugural four-day Test could be over inside two days after South Africa skittled Zimbabwe for only 68 at St George's Park on Wednesday.
Zimbabwe resumed on 30-4 in reply to 309-9 declared on day two and were unable to dig themselves out of a hole, Morne Morkel taking 5-21 after claiming three wickets under the lights on Tuesday.
The International Cricket Council gave the go-ahead for the match in Port Elizabeth to be trialled over four days rather than five, but it is unlikely to last even the shortened distance.
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Kyle Jarvis (23) and Ryan Burl (16) were the only batsmen to reach double figures as the tourists were dismissed for their fifth-lowest Test total, South Africa needing only 14 overs of the opening session to wrap up the innings.
Stand-in captain AB de Villiers, again donning the wicketkeeping gloves in the absence of hamstring-injury victim Quinton de Kock, took four catches in Zimbabwe's pitiful first innings before enforcing the follow on.