Former light heavyweight title challenger  Khalil Rountree Jr . was slated to face former champion  Jamahal Hill in the UFC Kansas City main event on April 26, but an injury forced Hill out of the fight.  The fight promotion made the announcement on Tuesday and revealed a new main event for the fight card. Welterweight contender Ian Machado Garry  will take on the red hot Carlos Prates in the new headliner. Rountree reacted to the news of Hill’s injury and losing the UFC Kansas City main event spot  in a video posted to his  YouTube channel .  “So, I just got off the phone with the UFC, and it appears that Jamahal Hill is injured, not able to fight in Kansas City on the 26th of April,” Rountree Jr. said in the video. “So, looks like I’m out of a fight, and it’s going to be postponed