The mailmen needed a Joackins Atudo thunderbolt to bag maximum points and move second in the log with 33 points, one less than leaders Gor Mahia, who have played a match less.
Coach Sammy 'Pamzo' Omollo has lauded his charges for an excellent display. "First we knew it was going to be a tough call against Tusker, they are the champions with a good team that has experience and quality.
We had a good organization. Everyone was committed on the pitch and at long last, we managed to get a win," Omollo told Goal.
"Winning against a team like Tusker is a motivation to us and it will give us confidence ahead of our future assignments."