Moments ago Bob Arum informed Boxingtalk.com that Top Rank has committed to provide Showtime with a championship boxing doubleheader that will feature WBO welterweight champion Antonio Margarito making a title defense,  and undefeated junior welterweight champion Miguel Cotto making his 147 pound debut. No opponents have been solidified as this goes to print. Obviously as Arum confirmed Top Rank's $8M offer for undefeated pound for pound king Floyd Mayweather Jr to face Margarito is officially off the table. (7:40)