Tenni first travelled to the Isle of Man TT in 1935. For a newcomer, he performed remarkably well. He was lying in second to his teammate Woods, when he crashed in a fog bank on the mountain section.
In 1935, Tenni made his initial appearance at the Isle of Man TT. As someone new to the event, he performed impressively well. He was in second place behind his teammate Woods until a crash occurred during the mountainous part of the race due to fog.