Shakib Al Hasan produced an impressive all-round performance as Bangladesh sealed a spot in the Super 12 with a big victory against Papua New Guinea in Muscat.
The Tigers, who lost their opening match against Scotland, backed up their vital victory over Group B hosts Oman with a 84-run success against tournament debutants PNG on Thursday.
Scotland's subsequent defeat of Oman means Bangladesh go into group 1 with Australia, holders West Indies, England, South Africa and Sri Lanka.
Despite losing Mohammad Naim to the second ball, without a run scored, Bangladesh racked up 7-181 off their 20 overs. Mahmudullah cracked 50 in 28 balls, Al Hasan scored 46 in 37, and Lifon Das 29 in 23.
Mohammad Saifuddin ended with 19 not out after hitting the last three balls of the innings for 16.
PNG began cautiously, reaching 0-11 off 15 balls, but then wickets began to tumble. By the end of the fifth over they were 4-14 and the tie was effectively over.
Al Hasan took 4-9 off his four overs as PNG were further reduced to 7-29.
However, the sixth wicket had brought Kiplin Doriga to the crease. Swinging freely he scored exactly as many as all his team-mates combined, thumping 46 off 34 balls.
The wicketkeeper, who was 26 on Monday, was one hit away from a half-century when the final wicket fell with three balls remaining and PNG dismissed for 97.
"Now the pressure is gone and we can express ourselves and play with more freedom," said Al Hasan, relieved at Bangladesh's qualification.
Mahmudullah said: "The way we want to play was today's game. We did a very good job to put up a 180-plus score and the bowlers did a really good job,.
Looking towards the next stage the Bangladesh captain added: "The two things we've been concerned about are the first six overs with the bat and the ball, if we can get a good start we can capitalise."
"We just couldn't execute our death bowling under pressure against a really experienced team," said Assad Vala, Papua New Guinea's captain, "[but] there's a lot of we can take from this [tournament]."
Australian Associated Press