|| Bangladesh tasted a humiliating series-sweep after a reckless batting paved the way for a seven-wicket defeat to Australia in the third and final T20 International at Bir Shrestha Shaheed Flight Lieutenant Motiur Rahman Stadium in Chattogram today.The hosts could manage only 109-8 after opting to bat first, with captain Towhid Hridoy standing as the lone bright spot through a fighting 61 off 51 balls, laced with three fours and three sixes.Rishad Hossain was the only other Bangladesh batter to reach double figures, making 16, as the rest of the batting line-up crumbled under pressure.Australia made light work of the modest target, powered by a blistering 60 off just 28 balls from captain Mitchell Marsh. His explosive innings propelled the visitors to 112-3 in only 11 overs, sealing a comprehensive victory and a 3-0 sweep of the series.Australia had won the opening match by four wickets and the second by seven runs, completing a remarkable turnaround after losing the preceding three-match ODI series 2-1 to Bangladesh.Chasing 110, Marsh and Josh Inglis launched an aggressive assault on the Bangladesh bowlers, racing to 54 runs in the first six overs. Left-arm spinner Nasum Ahmed provided the breakthrough by dismissing Inglis for 17.Marsh brought up his 14th T20I half-century in just 23 balls with a slog-swept six off leg-spinner Rishad Hossain and looked set to finish the game unbeaten. However, pacer Shoriful Islam, one of Bangladesh's three changes for the match, had him caught by Shamim Hossain with Australia still needing 22 runs.Tim David then wrapped up the chase in emphatic fashion, smashing consecutive sixes off Rishad. David remained unbeaten on 12, while Matt Renshaw, who struck 89 not out in the previous match, was unbeaten on six.Earlier, Hridoy's decision to bat first after winning the toss backfired as Bangladesh lost openers Tanzid Hasan Tamim and Saif Hassan in the second over. Tanzid was run out, while Saif was deceived by a slower delivery from Spencer Johnson.Bangladesh never recovered from the early blows despite Hridoy's determined resistance. Wickets continued to fall at regular intervals, raising the prospect of the hosts being bowled out for less than 100.Hridoy, however, played a few attacking strokes towards the end of the innings to push Bangladesh past the 100-run mark and avoid a more embarrassing total.