Joshua beats Parker, becomes 3-belt heavyweight champion

Britain's Anthony Joshua celebrates victory over New Zealand's Joseph Parker, left, after their WBA, IBF, WBO and IBO Heavyweight Championship title bout in Cardiff, Wales, late Saturday, March 31, 2018. (AP Photo/Frank Augstein)

CARDIFF, Wales — Anthony Joshua was taken the distance for the first time before beating Joseph Parker by unanimous decision and becoming a three-belt world heavyweight boxing champion on Saturday.