Steelers' Vikas Kandola thrilled the audience with his Super 10 as the home side produced a successful tackle in the dying moments of the game to bag the nail-biter.
The first half was completely dominated by the Gujarat side, which came as no surprise considering the winless run of Thalaivas.
With the victory, Mumbai jumped to the fourth place in the points table to consolidate their chances of making to the play-offs.
Following the win, Mumbai climbed to the fifth spot in the points table while the Pink Panthers remained third.
Delhi inflicted an all-out in the 18th minute to take the lead for the first time in the match. At the end of the first half, Delhi led 14-11.
Patna have won the PKL title for third consecutive season now.
