South Africa were all out with 19 balls still to face, setting India a modest target that Kohli comfortably reeled in with a flourish of stroke play.
"It's all about being in a good zone," Kohli said after being named man of the series. "On the day I felt good and my timing was right. I want to lead from the front with my performances."
India, who lost the three-match test series 2-1, now play South Africa in three Twenty20 internationals at end of their two-month tour.
(Reporting by Mark Gleeson in Cape Town, editing by Toby Davis)
