Fleet-footed teenager Asim Biswas struck in the dying minutes as Tollygunge Agragami stunned defending champions Mohun Bagan 1-0 in the National Football League in Kolkata on Thursday.
Nigerian Akeem Abolanle did the spadework on the left flank and essayed a fine cross to Moses Oweera, whose right footer was deflected into the net by Biswas with a fine diving header, which caught the entire Bagan defence, including goalkeeper Bivas Saha, on the wrong foot.
Bagan paid the price for being a man short in the defence as stopper Isha Musah Eroje was given marching orders after being shown his second yellow card of the day, seven minutes prior to the goal for deliberately handling the ball.
Eroje had earlier been booked in the Salt Lake Stadium outing for an infringement.
Bagan were unlucky not to have taken the lead in the first half when Lolendra Singh's header rebounded off the post.
They stepped up the accelerator after the breather, but failed to capitalise on the chances that came their way.
Tollygunge, on the other hand, played a good passing game and attacked on the counter with their foreign recruits Akeem, Isiaka Abayomi and Moses having a good game.
After today's result, Bagan remained on 12 points from eight matches, while Tollygunge swelled their tally to seven from six matches.