(NOV 20) NEW YORK – Unified Women’s Super Middleweight World Champion Claressa Shields will defend her 168-pound titles against undefeated IBF mandatory challenger Tori Nelson on Friday, Jan. 12 live on SHOWTIME.  A two-time Olympic Gold Medalist, Shields (4-0, 2 KOs) will face her second consecutive undefeated opponent in the main event of ShoBox: The