Sparring Partners who Eventually Fought Eachother

Ike Quartey and Winky Wright were pretty good friends. They trained and sparred together in Europe.

 

I guess if it is whether they sparred a handful of times, then most of the heavyweight match ups will likely qualify.

But of late, I gather Helenius was a regular sparring partner of Wilder, and Wallin sparred a lot of rounds with Joshua.