Arum sees promoting Rigondeaux as a tough challenge now

By Dan Ambrose: Top Rank promoter Bob Arum was less than impressed with the manner that WBA super bantamweight champion Guillermo Rigondeaux (12-0, 8 KO's) unseated his much more popular fighter in WBO super bantamweight champion Nonito Donaire (31-2, 20 KO's) last night in beating him by a 12 round unanimous decision in a fight