Take a look at the meteoric rise of Julio Cesar Chavez Jr.'s undefeated career. Chavez Jr. vs Martinez happens Sept. 15 on HBO PPV. For more information on HBO Boxing, visit http://itsh.bo/HQspBS. <br /><br />Watch HBO Sports series and events online at HBO GO® http://itsh.bo/mxUXD0.<br /><br />Watchin HBO Boxing events on one screen, connect on another: http://connect.hbo.com/hbo-boxing/
