5 UFC fight cards ruined by a fighter

#4. José Aldo, UFC 176

Well into his featherweight championship reign, José Aldo seemed like an unstoppable force at 145 lbs. At UFC 176, he was scheduled to face Chad Mendes in a rematch of their previous encounter years ago.

Aldo had won their first outing in dominant fashion, flooring Mendes with a brutal counter-knee as his foe shot in for a takedown. To rebuild himself for another title fight, Mendes embarked on a 5-fight win streak, earning 4 stoppages.

Anticipation was high for the rematch, yet worries persisted due to Aldo's penchant for pulling out of scheduled bouts. The Brazilian's history of frequent injuries was allegedly caused by the number of gym wars that once took place at Nova União. Unfortunately, a month before the scheduled matchup, 'Scarface' withdrew from the bout.

While the promotion scrambled to find a short-notice opponent to replace Aldo, their attempts were unsuccessful and the event was ultimately scrapped.

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#3. Conor McGregor, UFC 223

UFC 223 is curious in that it did but also didn't involve Conor McGregor. The Irishman was not scheduled to fight at the event, but the lightweight championship he once held was being contested for. The main event featured Khabib Nurmagomedov facing Al Iaquinta.

Prior to the bout, a series of events involving Nurmagomedov and fellow Russian Artem Lobov culminated in a public confrontation between the two men.

Incensed over Lobov negatively speaking about his past withdrawals from bouts, 'The Eagle' slapped him in a filmed video that quickly reached 'The Notorious'.

As a friend of Lobov's, McGregor was furious. He immediately gathered his posse and flew to New York on his private jet. Upon his arrival, the Irishman infamously attacked the bus carrying Nurmagomedov and other fighters scheduled to fight at the PPV.

A metal chair was thrown at the windows, shattering the glass. The incident led to Michael Chiesa withdrawing from a bout with Anthony Pettis due to lacerations from shards of glass. Ray Borg was forced to pull out of his bout for similar reasons, while Artem Lobov was removed from UFC 223 for his participation in the melee.