A person who competes in ten athletic events is called a decathlete.
I don't think he has one, he competes in all different distance events.
Black shorts may be worn for wide variety of different occasions, and can even be worn at athletic events. If the black shorts are comfortable, it might be even better for an athletic event.
The correct terminology for this would be a "quadrathlon"(quadrathon).
Tom competes in various diving events.