"I am feeling very happy and proud but also very humble. I have worked hard and it has paid off."
Despite his victory in the 100m, Marcel was frustrated that he was unable to clinch the 200m outdoor crown to match up with his indoor title securing the bronze medal, with another season's best performance of 22.73.
Marcel was also part of the 4x100m GB relay team which also picked up a bronze medal.
Marcel now has his sights set on the 2016 Paralympic Games, but to do so he has to move away from the track and on to the long jump, one of only three disciplines which are competed for at T/F20 level alongside 1,500m and the shot putt.