The Stags defeated Balestier Khalsa 3-1 at Jurong West Stadium on Saturday night, with Dzoni's 50th-minute goal effectively sealing the contest after the home side had scored twice in the first half.
"I was not satisfied with the result. I thought we should do better. I'm not happy with performance. We did okay until we conceded first goal where we lost concentration," Balestier Khalsa head coach Marko Kraljevic said.
"The problem is up front and putting the ball in the net. We're trying to solve and change. We need to win against Young Lions next, it's tough not playing for 17 days before this game but no excuse."
Balestier have the equal-worst scoring record this season, with only five goals in 11 matches.