THE STORY
On August 23, 2012, UFC 151, scheduled for September 1 in Las Vegas, was canceled after challenger Dan Henderson withdrew due to a knee injury. Champion Jon Jones declined to fight replacement opponent Chael Sonnen on short notice, leading to the event's cancellation. (ufc.com)
TEAMS / PEOPLE:
UFC, Jon Jones
WHY IT MATTERS
This marked the first time in UFC history that a champion refused a replacement opponent, resulting in the cancellation of an event. (latimes.com)