Australia beats South Africa by 8 wickets to seal the series.

Australia won the toss and invited South Africa to bat first, Sourth Africa batted first, started the inning not very well, Reeza Hendricks and Temba Bavuma came to start the inning, the first wicket has dismissed for 36 runs in first ball of the 4th over, Temba Bavuma dismissed after playing a brilliant quick inning of 35 runs with the help of 1 six and 6 boundaires in just 17 balls, next batsman Rassie van der Dussen came to bat and he dismissed just for 6 runs in 7 balls as second wicket in 4.2 over, the team score was 44 runs, next batsman Aiden Markram came to bat, meanwhile the third wicket also dismissed for 46 runs in 5.3 over, Reeza Hendricks dismissed just for 3 runs in 9 balls, next batsman Dewald Brevis came to bat and he was dismissed just in 1 ball without scoring as fourth wicket in 5.4 over, the team score was just 46 runs, followed by Tristan Stubbs came to bat handled the inning and played a brilliant half-century parntership of 51 runs with Aiden Markram, the fifth wicket has dismissed for 97 runs in 12.2 over, Tristan Stubbs dismissed after scoring 27 runs with the help of 1 six and 3 boundaires in just 20 balls, next batsman Bjorn Fortuin came to bat and he dismissed just for 8 runs in 8 balls as sixth wicket in 13.5 over, the team score was 106 runs, next batsman Gerald Coetzee came to bat and he good strike rotate with Aiden Markram, the 7th wicket dismissed for 147 runs in last ball of the 18th over, Gerald Coetzee dismissed for 11 runs in 11 balls, next batsman Lungi Ngidi came bat, meanwhile the 8th wicket also dismissed for 149 runs in 18.3 over, Aiden Markram dismissed after playing a brilliant inning of 49 runs with the help of 2 sixes and 3 boundaires in just 38 balls, followed by
Lizaad Williams came to bat and he was remains unbeaten for 1 run in 3 balls with Lungi Ngidi, and Lungi Ngidi played an unbeaten inning of 13 runs with the help of 2 boundaires in just 7 balls. In this way, South Africa scored 164 runs after losing 8 wickets in the stipulated 20 overs and set a taget of 165 runs for Australia.

Australian bowlers performed very brilliant bowling, Sean Abbott took 3 wickets just for 22 runs in his spell, Nathan Ellis 3 wickets just for 25 runs in his spell, Jason Behrendorff 2 wickets just for 25 runs in his spell, Adam Zampa was wicketless for 42 runs in his spell, Aaron Hardie wicketless for 29 runs in 3 overs, and Matthew Short also wicketless for 13 runs in 1 over.

source

Australia chasing 165 runs in the second inning the achieved the target very easily for losing just 2 wickets in fifth ball of the 15th over and won the match by 8 wickets. Australia started the inning very well, Matthew Short and Travis Head came to start the inning, the first wicket has dismissed for 32 runs in 4.3 over, Travis Head dismissed for 18 runs with the help of 4 boundaires in 17 balls, next batsman Mitchell Marsh came to bat handled the inning and played a very brilliant century partnership of 100 runs with Matthew Short, the second wicket has dismissed for 132 runs in last ball of the 12th over, Matthew Short dismissed after playing a very brilliant quick half-century inning of 66 runs with the help of 4 sixes and 7 boundaires in just 30 balls, followed by Josh Inglis came to bat and he was remains unbeaten for 2 runs in 3 balls, and Mitchell Marsh played a very brilliant unbeaten quick half-century and a victory inning of 79 runs with the help of 6 sixes and 8 boundaires in just 39 balls.
In this way, Australia chased the target very easily for loss of just 2 wickets in 14.5 overs and won the match by 8 wickets and also seal the series.

South African bowlers Lizaad Williams got 1 wicket for 17 runs in 2 overs, Tabraiz Shamsi 1 wicket for 40 runs in his spell, apart from this, all bowlers are wicketless, Aiden Markram wicketless for 13 runs in 2 overs, Lungi Ngidi wicketless for 41 runs in 2.5 overs, Gerald Coetzee wicketless for 32 runs in 2 overs, and Bjorn Fortuin also wicketless for 25 runs in 2 overs.

source

PLAYER OF THE MATCH- Australian bowler Sean Abbott was selected as the best player of the match, he performed very brilliant bowling took 3 wickets just for 22 runs in his spell.
reference

You can watch full match highlights here