Jon Jones, an acrobatic 24-year-old light-heavyweight champion, is fast becoming the most marketable fighter in Ultimate Fighting Championship.
Lyoto Machida is the increasingly desperate former champion, a 33-year-old karate specialist who needs to end the reluctant fighting style that cost him two bouts last year and start aggressively unloading his arsenal of skills.
Together, the men have the chance to create a special fight Saturday night at UFC 140 in Toronto.
"There could be some cool, tricky things going on in there," said Jones (14-1), making his second title defense.
Jones, whose only "defeat" was a first-round disqualification for throwing too many blows to the head of a beaten-up Matt Hamill in their 2009 fight, helps UFC advertise beer and cellphones, and he has his own endorsement deal with K-Swiss shoes and apparel.
The draw is his fighting style: spinning punches and kicks; discipline in the sport's most important base, wrestling, and active throughout.