5 of the most controversial suspensions in UFC history

#3 Brock Lesnar

Brock Lesnar made his MMA return at UFC 200 in July 2016.

2016 featured one of the biggest years of the UFC and mixed martial arts as a whole. The sport was finally legalized in the state of New York, superstar Conor McGregor had his epic fights with Nate Diaz, and later became the first ever simultaneous two-weight UFC champion and Brock Lesnar made his MMA return at UFC 200 in July of that year.

It was Lesnar's first MMA fight in five years, and he was going up against future Hall-of-Famer Mark Hunt in the night's co-main event feature. Lesnar won via a dominant unanimous decision verdict, showing fans that he could still fight at the highest level at 38 years of age.

However, his comeback celebrations were short-lived, as it was revealed during both in-competition and out-of-competition tests that he had estrogen blocker clomiphene in his system. It resulted in the fight being overturned to a no-contest, and Hunt being livid about the idea that he risked his life, fighting someone with illegal substances in his system.

Recently, UFC president Dana White brought up the possibility of Lesnar's UFC return, which rightfully drew negative reactions from Hunt and many MMA fans.