Arum: Guerrero has a great shot at beating Mayweather on May 4th

By Chris Williams: Bob Arum of Top Rank believes Robert "The Ghost" Guerrero (31-1-1, 18 KO's) has a good chance of pulling off an upset over WBC welterweight champion Floyd Mayweather Jr. (43-0, 26 KO's) on May 4th. Arum is going the opposite way of conventional wisdom because few boxing fans are giving the much