Rossouw showcased his batting prowess by bringing up the first century of the ongoing showpiece with a 56-ball 109, while Quinton de Kock hit a fifty to take South Africa to an impressive 205 for 5.
Nortje then returned with his best T20 figures as the bowlers rallied to bowl out Bangladesh for 101 in 16.3 overs.
After a total of 200 plus, Bangladesh openers looked up to the task. Soumya Sarkar (15) and Najmul Hossain (9) bagged 26 runs from the first two overs, including 17 from the first Kagiso Rabada (1/24) over.
South Africa claim a resounding win over Bangladesh, sealing two crucial points. #T20WorldCup | #SAvBAN | 📝:… https://t.co/qvni9X4sLn
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Skipper Temba Bavuma’s move to replace Rabada with Nortje paid immediate dividends as the pacer blew apart the Bangladesh top order within the first five overs.
Nortje struck twice in his opening and bagged both openers. Soumya was the first to go after being caught behind and Hossain soon followed.
Nortje returned to catch Shakib Al Hassan (1) leg-front to leave Bangladesh at 39 for 3.
Afif Hossain (1), who was next to depart when Rabada joined the party, got the better of some pace and extra bounce. It could have been two for the pacer had Trsitan Stubbs not dropped Litton Das.
🚨 RESULT | SOUTH AFRICA WINS BY 104 RUNS The bowlers supported the batting performance led by Rilee Rossouw’s second… https://t.co/BP3cuIcBNs
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Once spin was set, Mehidy Hasan (11) looked set to play big, but got the bat when Aiden Markram bowled it to wide-open front with no problems. He was Tabraiz Shamsi’s first victim as the spinner overturned three wickets behind.
Bangladesh’s batsmen struggled to get any partnership going.
Earlier, as the rain gods threatened to play spoilsport, Rossouw and de Kock rained down sixes in their 168-run partnership, the highest for South Africa in a T20 World Cup match.
The pair sent the ball 14 times to the fence and 11 times over it.
Temba Bavuma’s poor form continued as he fell for 2 in the very first over of a Taskin Ahmed (1/46) delivery after electing to bat.
But Rossouw and de Kock were at their aggressive best as the duo plundered 21 runs with three fours and a six from Taskin in his next over.
Rossouw then continued the attack and this time scored 16 runs from Mehidy Hassan (0/32).
Bangladesh got a bit of a break as rain interrupted play for 20 minutes and they were able to dry up the runs for a few overs after resumption, but the South Africans were soon back to business as usual.
With all the Bangladesh bowlers, Mustafizur Rahman (0/25) being tossed all over the ground, Shakib al Hassan (2/33) brought himself into the attack in the 11th over, but the captain too was met with similar treatment .
Rossouw blasted Shakib for a four and two back-to-back maximums. The South African launched the ball over deep square leg for the first six of the over and then again sent a full toss into the same area for a similar result.
The 33-year-old Roussouw brought up his half-century in 30 balls, de Kock’s fifty came soon after. The wicketkeeper completed the feat in style with a six over deep mid-wicket fence.
However, De Kock’s innings was brought to an end in the 15th over.
With new batsman Tristan Stubbs departing soon after and Rossouw heading for his century, the Protea innings slowed down a bit.
When Rossouw’s century arrived, he sent the ball for a towering six before Shakib ended the brilliant innings.
Heading for a score of 220-230 at one stage, South Africa lost momentum in the death overs on a two-pace wicket and just barely managed to cross the 200-run mark.