San Antonio, Texas - Jesus Soto Karass stopped Andre Berto with a left hook in the 12th round of their welterweight fight Saturday night, possibly ending Berto's once-promising career. Soto Karass (28-8-3, 18 KOs) surged in the fight from the fourth round as Berto began to lose effectiveness from his dominant right side. Though Berto (28-3) floored Soto Karass with a left-hand body shot in the 11th, Berto couldn't sustain the rally. By the end of the 11th, Soto Karass recovered, and then he closed Berto out with the left hand 48 seconds into the final round. The referee stopped the fight immediately.