UFC 303 的主赛原计划是麦格雷戈与钱德勒的对决，但由于麦格雷戈受伤而被取消，取而代之的是佩雷拉对阵普罗查兹卡的比赛。 UFC 303's main event with McGregor and Chandler canceled due to McGregor's injury, replaced by Pereira vs. Prochazka.

由于康纳·麦格雷戈受伤，UFC 303 的主赛（康纳·麦格雷戈和迈克尔·钱德勒的比赛）被取消。 UFC 303's main event featuring Conor McGregor and Michael Chandler has been canceled due to McGregor's injury. 这是麦格雷戈第一次因伤退出UFC比赛。 This is the first time McGregor has had to withdraw from a UFC fight due to injury. UFC 总裁达纳·怀特宣布了比赛安排的变化，亚历克斯·佩雷拉和吉里·普罗查兹卡之间的轻重量级冠军争夺战现在成为主赛，布莱恩·奥特加和迭戈·洛佩斯之间的轻重量级冠军争夺战成为新的联合主赛。 UFC President Dana White announced changes to the fight card, with a light-heavyweight title clash between Alex Pereira and Jiri Prochazka now the main event, and Brian Ortega and Diego Lopes in the new co-main event.