Floyd Mayweather Jr vs Tenshin Nasukawa (Full Fight 2018)

Mayweather had his first pro fight in October 1996, more than 18 months before Nasukawa was born, but even the friendly circumstances are liable to drag the competitive side out of the 50-0 king. That being said, the seasoned superstar is prepared to face a threat from Nasukawa, who holds a 28-0 record in kickboxing and made his debut in July 2014, one month prior to his 16th birthday.