World boxing champion Vitali Klitschko of the Ukraine knocks out challenger Odlanier Solis from Cuba during the WBC heavyweight title bout at the arena in Cologne, Germany, Saturday night, March 19, 2011. Vitali Klitschko retained his WBC heavyweight title with a first-round knockout of Odlanier Solis, who injured his knee in the fall on Saturday. Klitschko's right to Solis' left temple staggered the Cuban, who wobbled then fell on his back and clutched his right knee. (AP Photo/Michael Probst)