In Centurion, Proteas spinner Tabraiz Shamsi claimed figures of 3-18 in his four overs, helping the Northern Titans secure a 13-run victory over the North West Dragons.
Shamsi's impressive performance included the crucial dismissal of Raynard van Tonder, who had scored 48 runs off 33 balls.
Pace bowler Junior Dala also played a key role, taking 3-30 to help restrict the Dragons to 156-8.
Earlier, Proteas T20I captain Aiden Markram had contributed 40 runs off 30 balls to help the Titans reach a total of 169-7.
Migael Pretorius claimed figures of 3-18 in his four overs for the Dragons, with Duan Jansen (2-33) and Irvin Modimokoane (2-31) also taking two wickets each.