The two-time champions were completely off-colour with the willow as they played an astounding 54 dot balls (9 maiden overs) in 20 overs, a testimony to their plight.
Save Krunal Pandya (47 off 38 balls), who watched helplessly from the other end, none of the MI batsmen showed judiciousness expected on the grand stage. It was because of Krunal's late hitting (three fours and two sixes) that MI managed to reach close to 130 after being reduced to 79 for 7.
Patel mistimed a pull-shot that was taken by Shardul Thakur at mid-on while Simmons was foxed by a slower one which Unadkat smartly snapped inches off the surface.
At 8 for 2, Mumbai's most seasoned pair of skipper Rohit Sharma (24) and Ambati Rayudu (12) came together.
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However they couldn't get going with Washington Sundar (0/13 in 4 overs) again proving to be exceptional during the Powerplay overs.
Mumbai were under pressure at 16 for 2 in 5 overs before Rohit picked up Lockie Ferguson for some special treatment, hitting four boundaries to get a move on.
But it wasn't long before Rayudu was found short failing to beat Steve Smith's direct throw.
The MI skipper would be cursing himself as it was a half-tracker from Adam Zampa (2/32 in 4 overs) which he pulled to mid-wicket fence where Shardul Thakur showed fantastic balance while latching onto a well-judged catch.
At 56 for 5, Mumbai Indians didn't have any chance of recovery. Pandya brothers have had a good tournament but on the day when it mattered most, Hardik played across the line to Dan Christian to be adjudged leg-before.
Shardul once again showed street smartness as he backed up at the striker's end after Karn Sharma's catch was missed by Christian. But his throw saw Shardul racing past Karn to dislodge the bails leaving MI shattered at 79 for 7.