While it certainly could not be called an upset, Jose Luis Castillo knocked out Diego Corrales in the 4th round of their eagerly anticipated rematch. A few ‘experts’ remarked after the fight that Corrales had a glass jaw. That is yet to be proven as there is little doubt that Castillo is a big hitter. [details (http://www.boxingscene.com/?m=show&id=2161)]