David Miller and Kagiso Rabada combined to propel South Africa to a thrilling victory as they edged Sri Lanka by four wickets despite a hat-trick by Wanindu Hasaranga in the T20 World Cup on Saturday at the Sharjah Cricket Stadium.

With South Africa needing 15 off the final over, Miller smashed two sixes and Rabada struck the winning boundary as South Africa reached their target of 143 with one ball to spare in Sharjah.

Miller finished with 23 off 13 balls while Rabada made 13 off seven to carry their team home after Hasaranga took the third hat-trick in tournament history.

Hasaranga's figures of 3-20 were not enough for Sri Lanka who made 142 in their innings.

His triple strike was spread over the final ball of his third over and the first two of his fourth and pushed South Africa to a precarious 112-6 with his second victim, skipper Temba Bavuma, out for 46.

The left-handed pair of Miller and Rabada then smashed 34 runs between them to give South Africa their second straight win in the Super 12 stage.

Sri Lankan fast bowler Dushmantha Chameera had struck twice in his second over to send back the South African openers including de Kock caught and bowled for 12.

Bavuma stood firm to put on key partnerships including a 47-run fourth-wicket stand with Aiden Markram to raise hopes of a successful chase.

Markram made 19 before attempting an extravagant off drive against Hasaranga off the last ball of the 15th over but missed the ball that crashed into the stumps.

Hasaranga came back strongly in the 18th over to get Bavuma and Pretorius off the first two balls before Miller and Rabada robbed Sri Lanka, who have two losses from three Super games, of a win.

Ireland fast bowler Curtis Campher took four wickets in four balls in the qualification stage against Netherlands.

Australia's Brett Lee took the first hat-trick of the competition in 2007 against Bangladesh.

De Kock takes the knee

Earlier Sri Lanka's Pathum Nissanka hit 72 but South Africa bowled out their opponents for 142 in a match that began with Quinton de Kock taking the knee.

Tabraiz Shamsi returned figures of 3-17 from his four overs of leg spin and fast bowler Dwaine Pretorius also took three wickets after South Africa elected to field first.

De Kock returned to the South Africa starting lineup after missing the previous match to take up the wicketkeeping duties.

He knelt down in support of the anti-racism gesture along with the rest of the Proteas team.

Fast bowler Anrich Nortje struck first as he bowled Kusal Perera for seven in the fourth over, but Nissanka and Charith Asalanka put on 40 runs for the second wicket.

Aslanka was run out in an attempt to take a second before Shamsi took charge with his leg-spin bowling to push Sri Lanka on the backfoot. He made 21 off 14 balls.

Shamsi, who is the world's number one ranked T20 bowler, sent back Bhanuka Rajapaksa caught and bowled for nought and then got Avishka Fernando for three in a similar dismissal an over later.

Harasanga became Shamsi's third victim with Sri Lanka in trouble at 91-5 in the 14th over.

Nissanka hit back to reach his second half-century in the shortest format and smashed six fours and three sixes to surpass his previous T20 best of 61 and provide Sri Lanka with a fighting total.

He finally fell to Pretorius who had figures of 3-17 from his three overs.