On March 4, 1949, he defeated 1989 Boxing Hall of Famer Billy Graham in a somewhat close, rather uneventful ten round unanimous decision before 8,493 at New York's Madison Square Garden.

On August 27, 1951, DeMarco beat Saddler, the reigning World Featherweight Champion, in a ten round split decision at the Arena in Milwaukee, Wisconsin.

[5] DeMarco also beat Saddler on December 7, 1951, before 5,635, in another ten round split decision, this time at Madison Square Garden, boxing's New York cathedral.

[9] On February 1, 1950, DeMarco defeated Cuban lightweight contender Orlando Zulueta for the only time in a ten round unanimous decision at St. Nicholas Arena in New York.

He lost to Zulueta on two other occasions in close ten round decisions at Eastern Parkway Arena in Brooklyn, first on October 27, 1952, and again on September 21, 1953.

[10] DeMarco first defeated Henry Davis comfortably in a ten round unanimous decision at Madison Square Garden on November 21, 1952.

[1] In a major upset, that saw him as a 4-1 underdog in the early betting, DeMarco won the bout decisively on points and took the world title.

[14] In his first defense of the World Lightweight Championship, DeMarco lost the title November 17, 1954, to Jimmy Carter in a fifteen round TKO in Daley, California before 11,000 frantic fans.

[1] In the brutal and savage bout, the referee stopped the fighting in the final round, with DeMarco virtually out on his feet, his left eye nearly swollen shut, and his cheek rapidly turning a dark blue.

On October 3, 1955, though an underdog in the early betting, DeMarco defeated lightweight contender Kenny Lane in a ten-round split decision at the St. Nicholas Arena in New York.