#2. Robert Whittaker - UFC middleweight
Robert Whittaker was booked to defend his title against Luke Rockhold at UFC 221 but had to pull out due to a staph infection. Unfortunately, the infection wasn't treated properly and before the Australian knew it, the infection had tainted his stomach.
The infection started to eat away at Whittaker's organs. 'The Reaper' somehow managed to regain his fitness and recover from the illness. At UFC 234, after making weight for his fight against Kelvin Gastelum, the former middleweight champion started to experience sharp pain in his stomach.
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The pain got worse and worse and he was eventually shifted to the hospital. Whittaker was diagnosed with an abdominal hernia and a twisted and collapsed bowel. He was on the verge of getting his intestines busted, which could have meant him losing his life.
Whittaker was out for another eight months before finally returning to face Israel Adesanya in Australia.
Here is a video of Whittaker discussing his injuries with Ariel Helwani:
#1. Khabib Nurmagomedov - UFC lightweight
In 2017, Khabib Nurmagomedov was heading for the biggest fight of his life against Tony Ferguson for the interim lightweight championship. But 'The Eagle' almost died from a bad weight cut and was rushed immediately to the hospital. Nurmagomedov said every part of his body was in pain and he felt like he was about to die. Previous injuries combined with the near-death experience caused by the botched weight cut took a massive mental toll on him.
The Russian wanted to end his fighting career as he wasn't able to tolerate the setbacks that came continuously at him. He was motivated by his father to continue fighting despite these major difficulties and he did just that, capturing the lightweight title in the process. Nurmagomedov retired with an undefeated record of 29-0.
Watch this video explaining every injury Khabib Nurmagomedov suffered: