Tony de Zorzi struck his maiden international century to help Proteas trounce India by eight wickets in Gqeberha and set up an ODI series decider.
Proteas white-ball coach Rob Walter has hailed the importance of the Betway SA20 league for South Africa's domestic cricketers.
Batting coach JP Duminy insists the Proteas are still "trying to build a brand" in the 50-over format after a chastening defeat to India in the first ODI at the Wanderers.
India thrashed the Proteas by eight wickets in the opening One-Day International at the Wanderers after bowling the hosts out for just 116.
Indian skipper Suryakumar Yadav's century paved the way for a 106-run victory against South Africa in the decisive third T20 International at Wanderers Stadium.
Proteas spinner Tabraiz Shamsi believes the key to a strong national team lies in mass participation in global T20 leagues such as the Indian Premier League, SA20, and others.