The rules are simple....name a wrestler that beat the previous one for a championship! Only Japanese recognized changes and Japanese recognized titles. In example...when Liger lost the IWGP jr. Heavyweight title to Juventud, New Japan didn't count it. here's a starting point!!!
The Great Muta d. Riki Choshu for the IWGP title Aug 16th 1992
now the preferred option would be to name someone who defeated Muta *as Muta* for a title...but not the person who beat HIM for the same championship,in this case Hashimoto. Tag team titles are ok too.