Sri Lanka made a promising start but Dale Steyn removed Fernando and Dickwella in quick succession.

Perera and Dhananjaya de Silva scored 96 for the sixth wicket and threatened to take the game away from South Africa.

Keshav Maharaj dismissed de Silva and Lakmal on consecutive deliveries to derail Sri Lanka's chase.

Kusal Perera scored a ton and struck his highest Test score.

Perera scored a 200-ball 153 as Sri Lanka sealed a thrilling one-wicket win.