Chael Sonnen thinks Tony Ferguson could be Khabib Nurmagomedov ’s toughest test to date and says the winner could legitimately lay claim to being the greatest lightweight in UFC history. Speaking to RT Sport , ESPN analyst Sonnen offered his take on the upcoming fight between UFC lightweight champion Nurmagomedov (28-0 MMA, 12-0 UFC) and former interim champion Ferguson (25-3 MMA, 15-1 UFC) at UFC 249 on Apr. 18
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