The on-loan Dempo SC player got on the end of Romeo Fernandes' intimidating cross in FC Goa's third minute opener, although the same was attributed as an own goal scored by the opponent's defender Souvik Chakrabarti.
Mandar played an inspirational role on the left wing and almost set up team-mate Reinaldoda Cruz Oliveira, who eventually scored Goa's second goal, in the 24th minute besides missing a golden opportunity in the 74th minute but was unsuccessful to get past goalkeeper Sanjiban Ghosh.
"All credit goes to the coach (Zico) because he has given us the confidence," added the 23-year-old who was one of the Brazilian tactician's regular starters in the second half turnaround last season.
Mandar feels that his side has developed a better chemistry and co-ordination among players who struggled a bit to get started last season.
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"This year we are attacking more fluently as we took some time to adjust last year. This time we started with a win. So it's really good," he remarked.
"To play with big names, local players have to give their best. Obviously, they are the best and we cannot compare them to us. So if local players give their best, the team can really play good. The foreign players support us and we get the confidence to go forward," Mandar reasoned.