At Minimumweight we've seen very little in terms of changes with Filipino slugger Rey Loreto (#5) dropping a single place down the rankings.
At Light Flyweight we've seen some small changes. High up the rankings we've seen Takuma Inoue (#3) and Ryo Miyazaki (#4) both climb a single place. A more notable change has seen Ali Raymi (#6) climb a couple of places and move towards a world title shot. Lower down the rankings future “interim” title challenger Ma Yi Ming (#8) has moved up a place along with Filipino slugger Jonathan Taconing (#9), Paipharob Kokietgym (#10), Yu Kimura (#13) and future world title challenger Kwanthai Sithmorseng (#14)
In the Flyweight rankings the first change we've seen have been in the middle of the rankings where both Noknoi Sitthiprasert (#8) and Suguru Muranaka (#9) have both moved down a place. The most notable change here has been the ranking of Thai teenager Stamp Kiatniwat (#10) who has suddenly appeared in the rankings, possibly ahead of a title fight of some kind. Stamp's inclusion has come at the expense of compatriot Eaktawan Mor Krungthepthonburi (previously #12). In the lower part of the rankings we've seen Myung Goo Yuh (#13) drop a couple of places whilst Nawaphon Por Chokchai (#15) just holds on to a world ranking. Notably, though not at all surprisingly, we've lost Rommel Asenjo who came up short against Juan Francisco Estrada in a world title fight.
The Super Flyweight division hasn't had full scales changes though several Asian fighters have been moved up the rankings slightly. They are Rex Tso (#8), Petchbarngborn Kokietgym (#9) and Ryo Matsumoto (#10) who have each moved up a place, though strangely Masumoto is still listed at Super Flyweight despite stating he'll not be fighting in the division again.
At Bantamweight we've seen a bit of a shake up with a number of Asian fighters not edging towards a world title fight. As part of that shake up we've seen Zhanat Zhakiyanov (#3), Daiki Kameda (#4), Panomroonglek Kaiyanghadaogym (#5) and Ryosuke Iwasa (#6) all moving up a place near the top of the rankings.
The Super Bantamweight division has seen no changes in the rankings, despite the fact Shingo Wake (#2) has agreed to fight in an IBF eliminator in June.
At Featherweight we've seen some notable changes and now it seems Satoshi Hosono (#3) is on the verge of a world title fight after climbing a couple of places. Another climber here was Nonito Donaire (#4) who has made it clear he's going to be fighting at Super Bantamweight, despite climbing 3 places in this update. Lower down the rankings Dennis Tubieron (#10) has moved up a place.
The only change of note at Super Featherweight saw future world title challenger Jomthong Chuwatana (#7) climb up 3 places in the rankings ahead of his world title bout with “super” champion Takashi Uchiyama.
In the Lightweight division we've lost Takahiro Ao (formerly #3) though that's no surprise considering he has signed to fight for a WBO world title in early May.
At Light Welterweight we've seen no changes with Czar Amonsot (#13) remaining where he was. Likewise at Welterweight we've seen no changes, where Teerachai Kratingdaenggym (#5) remains where he was.
In the Light Middleweight division we've seen Kazakh slugger Kanat Islam (#8) move up a place.
We've seen no changes above Middleweight involving an Asian fighter with Cruiserweight Beibut Shumenov (#2) being the only ranked fighter of note above 154lbs.