The two sides were goal-less at the half time but scored thrice in the next 30 minutes, all field efforts with each strike counting as two under the new rules.
The Lancers, who had lost their opening match 6-8 against Uttar Pradesh Wizards on January 18, rallied from one-goal deficit after Dabang Mumbai had taken the lead through Florian Fuchs in the 35th minute.
The home side restored parity in the 45th minute through Adam Dixon before Glenn Turner struck what turned out to be the winning goal in the 51st minute.
A win fetches a team five points while a draw counts for two points. A team which loses with a goal difference of two or less will get a point while no point will be given for a side which loses with a goal difference of three or less.
The match began on a fast-pace note and both sides attacked vigorously without any goals. Both the goalkeepers found themselves busy, pulling off some good saves.
An alert striker Florian Fuchs gave Mumbai the lead through a field goal as he tucked in the rebound in the 35th minute.
The Lancers struck back in the final minute of the third quarter through a stunning field goal by Dixon and an action-packed Q3 came to an end with both teams finding themselves in a 2-2 deadlock.
Egged on by the partisan home crowd, the Lancers put constant pressure on the visiting Mumbai side in the final quarter and it finally paid off. The home side scored in the 51st minute through Turner with captain Moritz Fuerste setting it up to notch up their first victory of the tournament.
