Mumbai's 99-run win wasn't forecast. The Indians had lost four in a row, Rohit Sharma was still unfit, they picked two debutants, and were 3-44 in the powerplay.
But Tilak Varma's unbeaten 45-ball 101 — his maiden IPL century — gave his bowlers something to defend, and they defended 5-199 in rousing style.
Impact substitute and left-arm fast bowler Ashwani Kumar took 4-24, Mitchell Santner 2-16, and spinner Allah Ghazanfar 2-17.
Jasprit Bumrah and Hardik Pandya took a wicket each in the powerplay as Gujarat's stacked top order of Sai Sudharsan, captain Shubman Gill, Jos Buttler, Washington Sundar and Glenn Phillips were blown away inside eight overs and reduced to 55-5 on their home ground.
In a rare IPL match with no Australians on either side the Titans were all out inside 16 overs and their three-win streak was crushed.
"Ahmedabad has been a tough place for Mumbai Indians," captain Pandya said. "We played some good cricket. Feels very special because (the win) was much needed."
Left-hander Varma came into Mumbai's sixth game with a season-best score of 20.
Varma was 19 off 22 balls. Then he scored 82 off 23. He was especially aggressive in the last six overs. Varma smacked Ashok Sharma for 26 runs from three sixes and two fours in the 18th, and reached his hundred with a six and a four off Prasidh Krishna's last two balls in the final over that went for 22.
"Last five games I haven't had much time in the middle. So this game I wanted to spend time in the middle," Varma said. "So you saw the first 20 balls I was just batting ball by ball. Then later on I knew the ability I have."
He's the first IPL batter to outscore the opposition since 2020 when Lokesh Rahul's 132 trumped Royal Challengers Bangalore's 109.
Naman Dhir supported Varma with 45.
Gujarat never got any momentum after Bumrah finally got his first wicket in the sixth game when his first delivery was sent by Sudharsan straight to point.
The IPL's biggest win of the season by runs lifted Mumbai off the bottom of the table.
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