Proteas spinner Simon Harmer celebrates another Indian wicket.

The Proteas have traditionally relied on a battery of fast bowlers to terrorise the opposition, but Simon Harmer believes South Africa’s spin stocks "have never been this strong."

Harmer was the chief destroyer on the Proteas’ highly successful tour to India last year, where the off-spinner took 17 wickets at an average of 8.94. It propelled the visitors to a 2-0 clean sweep —the Proteas’ first Test series win on Indian soil since the turn of the millennium.

Prior to Harmer’s India heroics, left-arm spin-bowling all-rounder Senuran Muthusamy claimed a career-best 11 wickets in the first Test in Pakistan, before playing a significant role with the bat in the second Test in Rawalpindi.

After missing the first Test in Lahore due to injury, the Proteas’ most successful Test spinner of all time, Keshav Maharaj, also made an immediate impact upon his return in Rawalpindi. His match figures of 9/136 helped the visitors level the series.