Vitali Klitschko retained his piece of the heavyweight title Saturday night, dominating Arreola from the opening bell before Cris Arreola's corner finally decided he had enough and refused to let the challenger come out for the 11th round. It was the first loss for Arreola, who was trying to become the first Mexican-American to win a heavyweight title. Arreola spent almost the entire fight moving forward in an attempt to get inside his taller opponent, but paid a heavy price as Klitschko landed punches from almost every angle to his head and midsection. By the later rounds, Arreola's face was a bloody mess, yet he continued to plod forward in an increasingly desperate attempt to land a big punch inside. The fight ended with Arreola on his stool after the 10th round, still ready to fight some more when his trainer refused to allow him to go on. “He was taking too much punishment,” trainer Henry Ramirez said. “When I told him I was going to stop the fight he was irate.” Klitschko put on an impressive show, using both his reach advantage and his considerable ring skills to land left hooks followed by an assortment of right hands. But he was never able to put Arreola down, and never landed enough big punches to make him want to quit. “I know I was hurting him a lot but he has a great, great chin,” Klitschko said. “I was surprised he did not come out (for the 11th round).” One ringside just gave Klitschko all 10 rounds while the other two gave Arreola one round. The Associated Press had Klitschko winning every round. Ringside punch statistics showed Klitschko threw 802 punches, a huge amount for a heavyweight, and landed 301 of them. Arreola was credited with landing 86 of 331 punches. Diaz edges Chavez Former lightweight champion David Diaz returned from a 15-month absence to earn a majority decision victory over Jesus Chavez in Chicago Saturday. The 33-year-old Diaz seemed to take control during the ninth and 10th rounds, likely sealing the victory. Judge Mike Fitzgerald scored the fight 95-95, but Mauro DiFiore and Scott Dexter gave Diaz the decision by scores of 97-93 and 96