Ray Anderson was the first person to go 15 rounds against the pro boxer who fought in what two weight classes?
Ray Anderson (boxer):  Anderson became the first challenger to last fifteen rounds against Bob Foster for the world Light Heavyweight title, but he lost what was his only world title try by decision. Bob Foster (boxer): Robert Lloyd "Bob" Foster (December 15, 1938 – November 21, 2015) was an American professional boxer who fought as a light heavyweight and heavyweight.
light heavyweight and heavyweight