T20 expert Finch (67 not out) played the sheet-anchor's role as he batted through the innings to hit his third half century on the trot as tournament debutants Gujarat Lions notched up their third straight victory to remain on top of the table at the Wankhede Stadium here.
Chasing 144 for a win, the Lions lost an early wicket before Finch's 67 off 54 balls, studded with a six and seven fours, kept one end up and guide his side home to a well-deserved victory.
Gujarat Lions needed 11 runs from the last over and the 29-year-old Finch, who developed a hamstring problem in the 18th over, and Dhawal Kulkarni (6 not out) got the required runs with the Australian fittingly hitting a pulled four off the final ball bowled by Jasprit Bumrah after the scores were tied.
The visiting team, sans key all-rounder Ravindra Jadeja who opted out of the game due to his marriage tomorrow, played clinically efficient cricket to dump MI to their second defeat in as many home games this season.
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Only a late stand of 42 in the last three overs between Krunal Pandya (18 not out) and Tim Southee (25 in 11 balls) helped MI recover to some extent and post a score in excess of 140.
(REOPENS DEL 51)
Asked to bat first, Mumbai Indians batting failed to click for the second time in as many home games as they were restricted to 143 for 8 by Gujarat Lions.
The 42-run stand for the eighth wicket between debutant Krunal Pandya (18 not out off 10 balls) and Tim Southee, who used the long handle to hit two sixes and one four in a 11-ball 25, was the highest of the innings.
At the same ground on April 9, MI had been kept down to 121 for 8 by the other IPL debutants Rising Pune Supergiants before losing the tournament opener.
MI slumped into trouble straightaway by losing the wickets of captain Rohit Sharma and one-down Hardik Pandya in the second and fourth overs respectively.
Both were dismissed by Mumbai Ranji Trophy pacer Kulkarni who got a chance to play at his home ground since all-rounder Ravindra Jadeja did not accompany the team to the game as he's getting married tomorrow at Rajkot.
Both were planned dismissals with fielder Shadab Jakati stationed at square leg to pouch the flick by Rohit and the pull off a short ball by Pandya to leave the home team at a tricky 19 for 2.
But two wickets in the space of seven balls, that saw the backs of Buttler (16) and the big-hitting Kieron Pollard (1) put MI on the back-foot again at 59 for 4 just past the half-way stage of the innings.
Buttler, who hit three fours, was stumped on leg side by wicketkeeper Dinesh Karthik off a ball declared wide from left arm spinner Jakati soon after MI reached 50 in ninth over.
When Patel departed while attempting to hit a third six over mid wicket off Tambe's long hop, MI were in deep trouble.
Harbhjan Singh, who had made a counter-punching 45 against Pune, could not repeat that show, and with Rayudu too falling in trying to up the tempo, MI were 99 for 7 before adding 42 runs in the last three overs.