sentences:  Ruiz fought former champion Holyfield to fill the vacancy on August 12, 2000, losing by unanimous decision (this result made Holyfield the first to win a world heavyweight title on four separate occasions).Many observers and boxing reporters felt that the underdog Ruiz had done enough to win.Due to this controversial decision, the WBA ordered an immediate rematch in early 2001, and Ruiz won the WBA title.