Such was the intensity of the game that one player from each side was red-carded in the first half.
The goal-getters for the home team, which scored its second successive win, were their Romanian captain Lucian Goian (12th minute), the Brazilian mid-field duo Everton Santos (43rd) and Thiago Santos (49th) and Indian international Balwant Singh (79th minute), his fifth of the season and third in the last two matches.
Delhi, who had suffered a 1-5 defeat to FC Goa earlier, remained at the bottom of the league by suffering their sixth successive loss in seven ties.
The closing stages of the first half of the match, played at a fast pace with plenty of fouls marring it, deteriorated into a physical fight and resulted in the sending off of Sehnaj Singh of Mumbai and Claudio Matias of Delhi for indulging in a fracas in added-on time.
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The latter retaliated and referee Rahul Kumar Gupta red- carded both, who later continued to fight in the players tunnel, leaving both the teams with ten men to play with in the second half.
Before the fracas, Mumbai dominated the half and deservingly took a handy 2-0 lead too while Delhi muffed a few chances that came their way.
Mumbai were on the attack from the whistle and got a penalty awarded when the speedy Everton Santos, put through by a Raju Gaekwad-Balwant Singh combined move, was brought down by a flying tackle from Delhi custodian Arnab Das Sarma on the left side of the penalty area.
The 12thminute goal by the home team skipper stung Delhi a bit. Although they could not stitch some decent passes at a stretch, the effort was on and it nearly bore fruit midway through the session but for Romeo Fernandes and S Nandhakumar blasting wide in close succession.
In the 32nd minute, Mumbai goal had another close shave when Matiass stiff left-footer, after he took hold of a faulty clearance, hit the right post.
Down 0-2, Delhi attacked with gusto and nearly scored when a defensive error by Abinash Ruidas saw three successive attempts at the goal by the visitors went waste before the ugly fight between Sehnaj, who had returned after a four- yellow-card induced suspension, and Matias erupted and both were marched off.
Mumbai put the issue virtually beyond Delhi early in the second half by taking advantage of some inept defending by the visitors.
Thereafter the hosts, with ten men on the field like their rivals, stuck to their big lead and also increased it when Emanas chip into the penalty box was chested by Balwant whose weak left-footer was let in by Arnab as he was at the wrong side of the goal.
Balwant had scored both the goals in Mumbais 2-0 away win over North East United FC prior to todays game.
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