New Zealand have never played two specialist spinners at University Oval, so the odds don't favour the recalled veteran Jeetan Patel and Mitchell Santner pairing up in the first test starting next Wednesday.
Patel is back after playing two tests in India in October, his first in three and a half years, when he faced South Africa at Cape Town and Port Elizabeth, with limited success.
But the 36-year-old, despite a test average of 48.48 for his 58 wickets in 21 tests, has caught the eye for the selectors.
His ability to turn the ball away from the lefthanders got him into the ODI series, with decent success.
South Africa's probable test top seven will include three lefthanders - opener Dean Elgar, JP Duminy and wicketkeeper Quinton de Kock - which enhances Patel's chances.