Tom Aspinall 's father and head coach, Andy Aspinall, said he has yet to see an opponent truly test his son in mixed martial arts -- and he is beginning to think he never will.

On the surface, that might sound like an arrogant -- or at least very biased -- thing to say, but the results support it. Aspinall (15-3) faces Ciryl Gane (13-2) at UFC 321 on Saturday in Abu Dhabi (2 p.m. ET on ESPN PPV, prelims at 10 a.m.), in his first defense of the UFC's undisputed heavyweight title. If Gane, who is a 3-to-1 betting underdog, can simply make it to the second round, he'll be the first to survive an opening round against Aspinall in 4½ years. The 32-year-old's past three wins have come by knockout in 60, 69 and 73 seconds. His average fight time is the shortest in UFC history at 122 seconds.

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