LEDYARD, Conn. (AP) _ Mexican Yury Boy Campas, making his first International Boxing Federation junior middleweight title defense, stopped Anthony Stephens of Metairie, La., Monday night at the Foxwoods Resort Casino.

Stephens (29-9-2) could not answer the bell for the fourth round. He complained of extreme pain in his left shoulder following a grueling third round and ringside doctor Michael Schwartz said Stephens may have suffered a rotator cuff injury from a punch. The fighter was later examined at a hospital.

Stephens won the first round on all three judges' cards and tagged Campas, now 70-2, with two rights in the second.

Near the end of the third round, Campas appeared to be wearing Stephens down with body shots. Stephens appeared dizzy when he returned to his corner at the end of the round and later said it was a punch to his left shoulder in the first round that caused the discomfort.

Campas, who now has 60 knockout victories, was fighting for the first time since he won the IBF title with an eighth-round TKO of Raul Marquez Dec. 6. Campas has won his last six fights, four of them by knockout.

Stephens has now lost all three of his world title fights. He fought Marquez for the IBF junior middleweight title last April 12, losing on a ninth-round technical knockout. Stephens lost to Felix Trinidad in an IBF welterweight title fight on Oct. 23, 1993.