Frank Shamrock vs Bas Rutten in the SEG era UFC.
They fought in Pancrase before but obviously the rules would be completely different now and they had both evolved their game tremendously. It was the fight that was being rumored after Shamrock defended his title against Ortiz but never came to fruition because of his 'retirement'.
I would have loved to seen this, would have been a legitimate super fight, and it's unfortunate that it didn't happen. Pure speculation, but I think Shamrock would have taken it, he was on another level during his title run.
"To be truly walking on the warrior's path, we have to bring our minds back to the time when we were not ashamed of our dreams; when reality had not yet frustrated our ambitions; when our desire was still too strong to be repressed, and our spirit refused to surrender in resignation; when we were not yet doctors, businessmen, or lawyers, but still wanted to be heroes, leaders, bodhisattvas. The first step on the way to being warriors is to get back in touch with our dreams."