South Africa easily defeated Australia by nine wickets in Dubai, causing Australia to lose in the T20 World Cup semi-finals.

With 16 balls remaining, the Proteas reached their goal of 135 and denied the reigning champions a ninth participation in the final.

Anneke Bosch struck a sensational unbeaten 74 from 48 balls while captain Laura Wolvaardt added a classy 42 in a second-wicket partnership of 96 that left Australia reeling.

The epic run chase came after South Africa's bowlers had smartly restricted Australia to 134-5 in a curiously underwhelming innings.

Grace Harris and Georgia Wareham fell early in the powerplay before opener Beth Mooney dropped anchor with 44 from 42 balls.

But they paid the price for stuttering in the middle overs, with the run-rate rarely creeping over a run-a-ball as captain Tahlia McGrath trudged to 27 from 33.

Ellyse Perry's 31 from 23 and Phoebe Litchfield's nine-ball 16 added a late burst but the total still felt below-par on a pitch that favoured chasing, as West Indies proved against England on Wednesday.

South Africa started the chase confidently with a powerplay of 43-1, comfortably ahead of Australia's 35-2 at the same stage, before Tazmin Brits' departure for 15 kickstarted the phenomenal partnership.

Bosch, whose previous high score in the tournament was 25, crunched eight fours and a six in her match-winning effort which rewarded the faith of the South Africa selectors who kept her place at number three in the line-up, and saw them reach their second successive final after the 2023 edition on home soil.

The second semi-final takes place between New Zealand and West Indies at Sharjah on Friday, meaning Sunday's final will be the first in either white-ball format without Australia or England involved.

Brilliant Bosch stuns the world's best

Australia, the six-time winners of this competition, did not display the typical swagger and assurance after being put in to bat.

They only hit a total of 11 boundaries, demonstrating their timidity. That is in spite of their remarkable batting depth, which frequently allows them to play with far greater freedom than other teams that typically shield vulnerable, inexperienced middle orders.

Harris and Wareham's early departures did not feel catastrophic with the likes of Perry, Litchfield, McGrath and Ash Gardner to come - but with each over that passed by without an acceleration, there was a sense that such a kickstart would never appear.

In the end, being five wickets down felt like a big waste with the destructive Gardner and Annabel Sutherland left waiting in the dugout.

And they were punished for such caution as South Africa's innings was a complete contradiction.

Wolvaardt timed the ball beautifully from the outset with her trademark exquisite cover drives but Bosch's knock was a spectacle.

Against England in the group stage, the 31-year-old stuttered to 18 from 26 balls and did not look the part at three, but against the world's formidable force, she struck the ball with such clarity and power in a manner that we have yet seen in this tournament.

It is the highest individual score so far, and for that to be delivered under the most pressure and against such a high-quality opponent was astonishing - and the ease of South Africa's victory was such that even Marizanne Kapp was not required to bat.

Australia did not do too much wrong with the ball as Bosch did not even offer a chance, but they will rue their lack of ambition with the bat as they allowed South Africa to take one step closer to their first global title.

'One of our biggest wins ever' - reaction

England bowler Tash Farrant on BBC Test Match Special: "It is a really great thing that none of Australia, England or India are left in the tournament.

"People were concerned that with the domestic structures underneath those three sides that the gap would get bigger, but in World Cup cricket it is literally about who turns up on the day."

South Africa captain Laura Wolvaardt: "It is right up there with one of our biggest wins ever, the biggest win of my career for sure. It’s been such a good year for us and a real collective group effort.

"Anneke [Bosch] batted superbly and played her role perfectly, she played one of the best innings of her career."

Australia stand-in captain Tahlia McGrath: "It's pretty hard to take. We didn't show up tonight, you can't afford to do that in tournaments like this. Credit to South Africa.

"We've had this World Cup in our minds for a long time now, we were really well prepped, just didn't show up on the night."

Women's T20 World Cup, Dubai

Australia 134-5 (20 overs): Mooney 44 (42); Khaka 2-24

South Africa 135-2 (17.2 overs): Bosch 74* (48), Wolvaardt 42 (37); Sutherland 2-26

South Africa won by 8 wickets.