Mitchell Marsh's career-best unbeaten 177 not out steered Australia into the World Cup semifinals with an emphatic eight-wicket victory over Bangladesh in the 43rd match of the World Cup in Pune on Saturday.

Marsh's stellar innings, his second century of the tournament, ensured Australia's smooth chase of a 307-run target, guaranteeing them a spot in the last four against South Africa. The 32-year-old's powerful knocks included 17 fours and nine sixes, surpassing his earlier World Cup century of 121 against Pakistan.

The all-rounder, exhibiting strength on both the drive and square of the wicket, shared crucial partnerships, contributing to a stand of 120 with David Warner (53) and an unbroken 175 with Steve Smith, who made a morale-boosting 63 not out after returning from vertigo.

Australia's victory marked their seventh consecutive win in the group stage, rebounding strongly after two initial defeats. Bangladesh, posting their highest total of the tournament with 306-8, faced a formidable Australian side that overpowered their attack despite the absence of captain Shakib Al Hasan.

Nasum Ahmed's wicketless spell of 10 overs cost 85 runs, leaving Bangladesh reliant on other match outcomes for a top-eight finish and qualification for the 2025 Champions Trophy in Pakistan.

Australia began their chase with an early setback as Travis Head (10) departed, but Warner's aggressive start and Marsh's dominant innings negated any concerns. Warner's surprising dismissal, chipping a shot to stand-in skipper Najmul Hossain Shanto at mid-off, did little to deter Marsh's onslaught.

Despite facing cramps, Marsh continued his assault, including a six and a four against spinner Mehdi Hasan Miraz. His remarkable innings showcased the depth of Australia's batting lineup, proving they can thrive even without the services of Glenn Maxwell, who was rested for the match.

In the earlier innings, Towhid Hridoy's maiden World Cup fifty, a resilient 74, anchored Bangladesh's innings, but Australia's Adam Zampa (2-32) and Marnus Labuschagne's expert run-out efforts disrupted their flow. Hridoy's departure triggered a flurry of wickets, setting the stage for Australia's dominant run chase and securing their place in the World Cup semifinals.