Ghana defender Harrison Afful was back in action for Columbus Crew who beat Toronto FC 2-1 at home to go top of the Eastern Conference.
The right back missed last weekend's defeat to Chicago Fire due to a hand injury.
Afful lasted the entire as the Black and Gold came from a goal down to beat the Reds
His international teammate Jonathan Mensah missed the tie due to injury and fellow countryman Mohammed Abu was an unused substitute.
Toronto opened the scoring with a Jozy Altidore header off a Victor Vazquez corner kick in the 21st minute, but Kamara equalized with a 37th minute tap in off an assist by the rookie midfielder Niko Hansen.
The game-winner came in the 44th minute when midfielder Justin Meram cleverly placed the ball in the bottom corner of the net after Homegrown Player Alex Crognale headed a corner kick into the 6-yard box.