A tour that started with an unexpected Test series triumph ended with a second consecutive limited overs series defeat for Sri Lanka when South Africa won the third and final T20I by 45 runs on DLS method.
South Africa scored a mammoth 198 for two and Sri Lanka in reply were bowled out for 137 as they chased a reduced target of 183 in 17 overs following a rain delay at the Wanderers Stadium.
"In home conditions, South Africa are very tough," said Sri Lankan white-ball captain Lasith Malinga, who only joined the tour after Dimuth Karunaratne led his side to a historic Test series win.
Malinga said his side's inability to make early bowling breakthroughs, together with their own poor top-order batting, had been the main reason for their defeats.
"Going forward we realise what we need to do," he said.
The stand out performer from South Africa was all-rounder Dwaine Pretorius, who took advantage of a promotion in the batting order with an unbeaten 77 off 42 balls.
He followed up by breaking a rapid Sri Lankan first-wicket partnership of 42 when he trapped Dhananjaya de Silva with his first ball.
Opening batsman Niroshan Dickwella got to his 38 in no time while Isuru Udana played another hard-hitting lower-order innings, hitting four sixes and making 36 before Sri Lanka lost their last four wickets for no runs.
Pretorius and Hendricks (66) shared a 90-run stand for the second wicket before Duminy joined Pretorius in an unbeaten third-wicket stand of 71 off the last five overs. Duminy made 34 not out off 14 balls.
Sri Lanka suffered another top-order collapse, going from 42 for no loss to 79 for five and 96 for six before Udana’s onslaught.
Andile Phehlukwayo took four for 24.
Hendricks was named man of the series.