Roberto Elizondo of Los Angeles upset Hilmer Kenty, who told a referee that, because of stomach cramps, he could not come out of his corner for the third round of their scheduled 10-round lightweight fight yesterday in McAfee, N.J.

Kenty, a former World Boxing Association lightweight champion trying to make a comeback after recovering from a detached retina, was taken to a hospital for a neurological examination.

Kenty, ranked second by the World Boxing Council, came out fast in the first round and attacked Elizondo, seventh-ranked by the WBC, with a flurry of combinations to the body. But in the second round, Elizondo (25-3) pinned Kenty (23-2) against the ropes and scored almost at will with shots to Kenty's head and ribs. Kenty tried to fight off the ropes, but his blows appeared to have little impact on Elizondo.

When Kenty returned to his corner at the bell, he did not sit down but called for Tony Perez, the referee. Kenty told Perez his stomach felt cramped and that he had run out of energy.

Herbert Cassidy, the ringside physician, said: "Kenty said he felt a sudden loss of power and was very weak. He said he was unable to do anything when pinned against ropes in the second round. He had stomach cramps, no power or strength, and he felt he could not continue. That is a symptom of a concussive episode."

Unbeaten Venezuelan welterweights Mauricio Bravo and Mao de la Rosa each won his 26th fight on the Elizondo-Kenty undercard. Bravo won a disputed 10-round split decision over Pablo Baez and de la Rosa was awarded a second-round technical knockout when Elio Diaz could not continue because of torn ligaments in his left leg.

In Tampa, Fla., middleweight Mark Frazie of Tampa won a 10-round decision over Dwight Walker of Newark, N.J. It was Frazie's second victory over Walker. In their first bout, Walker was disqualified for repeated low blows.