Best track record of sparring mates becoming champions

[SlySlickSmooth]

Chavez Sr. sparred with Mosley, i think it was for one of the Taylor fights.

Tyson sparred Oliver McCall (lol)

Ali sparred Holmes for Foreman.

[prolific]

Who knows??boxers have sparred with pretty much most of the other boxers sometime in their boxing careers.

While it is true that boxers spar each other often.... I don't see how you could say "most." I don't think paq's habit of regularly sparring fighters that become world champions is typical. It seems to me that Chavez and Ali are the only ones that have regular sparring mates that became champions.

[Russian Crushin]

Fighters spar with everyone

Tommy hearns sparred with Ali