#3 Junior dos Santos
Former UFC Heavyweight Champion, Junior dos Santos would once have been a daunting opponent for Brock Lesnar.
At the peak of his powers, dos Santo's hand speed, flexibility, conditioning, and clinch skills would have given Lesnar plenty to think about.
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A Lesnar/dos Santos bout could well have been as one-sided as the Lesnar/Cain Velasquez fight at UFC 121, back in October 2010.
However, in 2018, dos Santos has not won consecutive fights in six years and Lesnar is the fresher of the two, having only fought once in the past seven years and enjoyed a part-time schedule in WWE over the past six years.
Lesnar, even at 41 years old would likely be the favorite in their fight. Despite neither being at their peak, a battle of the former champions would still be an enticing attraction and could easily go either way.