The third and final Twenty20 international of the series between South Africa and Zimbabwe was abandoned without a ball being bowled due to rain in Benoni.
South Africa was aiming to complete a 3-0 whitewash at Willowmoore Park, but no play was possible on Sunday.
The Proteas won all three one-day internationals and continued their dominance in the shortest format, a lack of runs costing the tourists.
South Africa spinner Imran Tahir was named man of the series after claiming T20 international best figures of 5-23 in the opener in East London.
Faf du Plessis' side will now head to Australia for a three-match ODI series and a solitary Twenty20 next month.