Under the Wankhede lights, the hosts romped home to a 44-run win after restricting Delhi to 165 for nine in 20 overs.
This game will be long remembered for the great catch Ricky Ponting took to see off Unmukt Chand off Harbhajan Singh on the first ball of the innings. Chand, the celebrated India under-19 captain, bagged his second golden duck of the tournament.
Earlier, Mumbai piled up 209 for five thanks to on-a-roll Dinesh Karthik (86 off 48 balls) and Rohit Sharma (74 not out off 50 balls). Aussie David Warner was the top scorer for Delhi with 61 off 37 balls.
Man of the match Karthik, who became the highest run-scorer (183) in the tournament, continued his sublime form in great style.
He notched up his second half-century in three matches. The Tamil Nadu man seemed least affected by the departure of stalwarts Sachin Tendulkar and skipper Ricky Ponting early on. He made his intentions clear when he hit Ashish Nehra’s second ball between point and cover for four.
Tendulkar was run-out for one before Ponting was choked by Irfan Pathan for a duck.
Karthik, however, set the mood for the evening, slamming Morne Morkel for two fours in his first over. Morkel, however, put an end to Karthik’s fireworks with Jeevan Mendis taking a simple catch at extra cover. It ended a 131-run stand for the third wicket.