Arguello stops him. Arguello always seemed to have a few issues with southpaws but I think it's just that he got hit a lot by them. He never had any issues landing, and subsequently pretty much destroyed them when shots started flying. The only guy I can think of who got the better of him is Ramirez, but he was still in his counter-punching days then. That wasn't Saldivar. Arguello takes him out late in a war.