Following the name of the champion(s): Indicates the number of times the competitor has held that title at that point.
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Indicates a gap in the listing where title changes are not known.
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Title was held or changed hands no later than this. In these cases, it is known that a competitor held the title at a certain time but not when he/she won it.
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Order uncertain. Different titleholders may be known for the same year, for example, but it is not known who held the title before whom.
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Unofficial or disputable claims. These are usually matches that certainly took place, but where there is doubt that the competitor shown should be recognized as a true title holder. These listings are also italicized.
Wins WBO Asia Pacific and OPBF titles; vacates OPBF title on 19-06-10; Asia Pacific title is vacant in 20-08 or 20-09 (no longer mentioned in WBO official ranking).
Nojima Hiroya
2022-07-24
Ōsaka, JPN
Defeats Nonaka Yūki; vacates on 22-12-20 upon moving down to the welterweight class.