Talented WBA super middleweight champion Mikkel “Viking Warrior’’ Kessler of Copenhagen, Denmark, will make his eagerly awaited debut on Showtime earlier than expected. One of the early favorites in the upcoming Super Six World Boxing Classic, Kessler (41-1, 31 KOs) will make a mandatory title defense against No. 1 ranked Gusmyl Perdomo (16-2, 10 KOs)…