A videó leírása: Take a look at the hard-hitting career of superstar Sergio Martinez. Martinez vs Macklin happens Saturday, March 17, on HBO. For more information on HBO Boxing, visit itsh.bo Watch HBO Sports series and events online at HBO GO® itsh.bo With HBO GO, you can watch your favorite HBO Sports series and events on your iPad® (itsh.bo iPhone® (itsh.bo or Android? (itsh.bo smartphone. Free with your HBO subscription through participating TV providers. Connect with HBO Sports on Facebook & Twitter: www.facebook.com www.twitter.com