Victory allowed the Proteas to avenge a shock T20 loss to the same opponents last weekend.
Steady rain restricted play to just the final session on the fourth day.
Bavuma's determined 86 and a more enterprising 78 from de Zorzi were linchpins in the Proteas' effort on a benign surface offering little for the bowlers but also made free scoring difficult because of its two-paced nature.
Bavuma was not involved in the T20 World Cup in which South Africa were beaten finalists.
Markram hoped that this would be the first of more finals to come, in particular when South Africa host the 50-over Cricket World Cup in 2027.
Markram paid tribute to those who were unable to overcome the hurdle in previous tournaments.
After skittling Afghanistan for 56 at Trinidad's Brian Lara Stadium, the Proteas cruised to their victory target, finishing on 60-1.
The Proteas piled up 194-4 off their 20 overs after being put into bat.
Bangladesh enter the T20 World Cup with a bit of uncertainty as they continue to look for their strongest XI. Experienced opener Litton Das has been out of form of late with an average of 13.16 this year in six matches. Although teammate Tawhid Hridoy is confident that Das will make a strong comeback in the tournament.
Victory allowed the Proteas to avenge a shock T20 loss to the same opponents last weekend.
Steady rain restricted play to just the final session on the fourth day.
Bavuma's determined 86 and a more enterprising 78 from de Zorzi were linchpins in the Proteas' effort on a benign surface offering little for the bowlers but also made free scoring difficult because of its two-paced nature.
Bavuma was not involved in the T20 World Cup in which South Africa were beaten finalists.
Markram hoped that this would be the first of more finals to come, in particular when South Africa host the 50-over Cricket World Cup in 2027.
Markram paid tribute to those who were unable to overcome the hurdle in previous tournaments.
After skittling Afghanistan for 56 at Trinidad's Brian Lara Stadium, the Proteas cruised to their victory target, finishing on 60-1.
The Proteas piled up 194-4 off their 20 overs after being put into bat.
Bangladesh enter the T20 World Cup with a bit of uncertainty as they continue to look for their strongest XI. Experienced opener Litton Das has been out of form of late with an average of 13.16 this year in six matches. Although teammate Tawhid Hridoy is confident that Das will make a strong comeback in the tournament.
Of the nine teams that have managed to play all the editions of the T20 World Cup since its inauguration in 2007 (Bangladesh, West Indies, India, Australia, England, Pakistan, Sri Lanka, New Zealand, and South Africa), the Tigers are the only side to have never qualified for the semifinal of the tournament.