Phehlukwayo and Dwaine Pretorius bowled brilliantly in the death to contain their opposition to 251 runs in 42.3 overs.
He suffered an injury while fielding.
Rassie van der Dussen has a batting average of 88.25 in ODI cricket.
In their last meeting, South Africa clean-swept the opponent in the five-match ODI series.
The Proteas all-rounders were brilliant in this game.
David Miller has been moved into batsman's category.
The Proteas will be looking forward to ending this season with one last win.
There will be a lot of focus on Isuru Udana, who was the star for Sri Lanka in the 2nd T20I.
Hendricks finally found some form after having a tough tour.
Fast bowler Anrich Nortje has a shoulder injury.