Mominul Haque was batting on six, with Najmul Hossain Shanto unbeaten on 4 with Bangladesh trailing by 537 runs when poor gentle introduced play to a detailed early.
Mulder endured nervy moments and dived into the crease to keep away from being run out earlier than his first century in exams, however he acquired there within the subsequent over with a giant six down the bottom off spinner Taijul Islam and raised his arms aloft.
With De Zorzi and Tristan Stubbs additionally getting their maiden centuries, it marked solely the second time in take a look at historical past that three batsmen had finished so in the identical innings.
Gerry Gomez, Robert Christiani and Clyde Walcott have been the primary trio when the West Indies confronted India in 1948.
After South Africa’s stand-in captain, Aiden Markram, known as time on its innings, Kagiso Rabada gave it the best begin by eradicating Shadman Islam for a duck and Zakir Hasan for 2 earlier than Mahmudul Hasan Pleasure fell to Dane Paterson for 10.
Nightwatchman Hasan Mahmud was castled by Keshav Maharaj for 3, leaving Bangladesh in serious trouble.
Earlier, De Zorzi picked up from the place he left off after notching up his century on Tuesday as South Africa collected runs with ease, having resumed at 307-2 on a batting-friendly observe on the Zahur Ahmed Chowdhury Stadium.
He reached his 150 with a lofted boundary off Taijul and adopted it up with one other instantly, because the hosts got here beneath strain early on one other sizzling, humid day on the southeastern coast of Bangladesh.
Bedingham was equally aggressive on the different finish and hit a quick-fire 59 however was bowled out by Taijul, who then trapped De Zorzi lbw and eliminated Kyle Verreynne for a duck shortly earlier than lunch to say his 14th five-wicket haul.
It was costly, nevertheless, as he completed with 5-198.
Senuran Muthusamy made an unbeaten 68 as he mixed nicely with Mulder in one other 100-run stand within the afternoon session and helped the Proteas go previous 500 runs in exams for the primary time since 2020.
South Africa is 1-0 up within the two-match sequence after their seven-wicket victory in Dhaka.
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