Mumbai, who had drawn two games and lost three, thus kept their quarter final hopes afloat by moving past the Lancers into the fifth place in the six-team tournament.
For the visitors, it was their sixth defeat in seven games and it resulted in them moving to the bottom of the table, and it would be very difficult for them to recover from this defeat and advance into the semi finals.
Mumbai scored both their goals via penalty corners, through an indirect conversion by Australian defender Jeremy Hayward and through their penalty corner expert Harmanpreet Singh in the 18th and 42rd minutes of the game.
The battle between the two outfits did not rise to great heights as far as speed and innovative moves were concerned. It was workmanlike hockey, at best.
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The first quarter saw the Lancers gaining the upper hand initially with moves by India international Lalit Upadhyay, but Mumbai defense held fort. Then it was Mumbai who were on the attack to earn two penalty corners which went waste.
But the hosts, winless in five previous games, shot into the lead three minutes into the second quarter off their third penalty corner award.
Stung to the quick by this reversal, the visitors attacked with gusto and succeeded in forcing three short corners in quick succession but all of these were wasted.
Crossing over with a 1-0 advantage, the Mumbai outfit made it 2-0 in the 13th minute of the quarter when Harmanpreet drag-flicked successfully to the left of rival goalie Charter.
The visiting team hit back almost immediately when off a fine move from the left along the byline, Somanna Pradhan squared to Amir Khan lying in wait close to the goal for the latter to deflect the ball in.