The newly vacated title is the WBO Minimumweight title which was recently vacated by Katsunari Takayama who has tried to keep his summer open for a super fight without the need for a mandatory title defence. The vacant title is now expected to fought for by Kosei Tanaka (#2), who is thought to have agreed a May 30th bout with Mexico's Julian Yedras (#1). Further down the rankings we've seen Xiong Zhao Zhong (#7) places into the top 15 ahead of Ali Raymi (#8) and Ryuji Hara (#9), who have both dropped a place. Other dropping a place have been Knockout CP Freshmart (#12) and Takumi Sakae (#13) whilst Jeffrey Galero (previously #14) has lost his ranking completely following a loss to WBC champion Wanheng Menayothin.
At Light Flyweight we've seen an odd change near the top of the rankings as Fahlan Sakkreerin Jr (#3) jumps straight into the top 3. A very odd move considering he has signed to fight for the IBF Minimumweight title on April 22nd. Lower down the rankings we've lost Filipino Benezer Alolod (previously #15).
At Flyweight we've seen a big hit to Zou Shiming (#7) who has fallen from being the top contender a month ago, his hit has obviously been a result of his loss to Amnat Ruenroeng in an IBF title fight. Shiming's fall has helped elevate Brian Viloria (#1) to the top spot. Lower down we've seen Suguru Muranaka (#8) fall 3 places in a hard to explain move. Another faller this month is Froilan Saludar (#9) who has dropped a single place.
In the Super Flyweight division we've seen a couple of changes that have effect Thai fighters. Firstly we've seen Oleydong Sithsamerchai (#13) drop a place and we've also lost Noknoi Sitthiprasert (previously #14).
The Bantamweight division has seen another hit to Thai fighters as Suriyan Sor Rungvisai (previously #11) has been removed, allowing both Shohei Omori (#12) and Ryo Matsumoto (#13) to move up a place whilst also creating space for Filipino fighter Alie Laurel (#15).
At Super Bantamweight we've seen a number of small changes. The first of those comes in the form of Nonito Donaire (#5) who has been ranked at 122lb's after having previously been #13 at Featherweight. Lower down the rankings Shingo Wake (#14) has been moved up a single place.
One of the biggest divisional shake ups this past month has happened at Featherweight where we have spotted notable changes involving Asian fighters. Firstly Donaire has been removed following his move down the weights, secondly Satoshi Hosono (#11) has moved up 3 places, we've sadly lost Marvin Sonsona (previously #15) from the rankings however we have got Chonlatarn Piriyapinyo (#15) in the rankings to replace him.
At Super Featherweight we've seen Juan Martin Elorde (#9) drop 3 places.
At Lightweight we've only seen one move involving an Asia as Yoshitaka Kato (#15) has dropped a place. The exciting news here however involved Takahiro Ao (#2) who is now set to fight Reymundo Beltran (#6) in a bout for the vacant world title.
In the Light Welterweight division Filipino fighter Jason Pagara (#6) has fallen down the rankings by a couple of places.
Another division with a faller is Welterweight where Fariz Mammadov (#11) has dropped a place. Thankfully the other change here is a positive one with Yoshihiro Kamegai (#6) climbing a remarkable 6 positions in a mysterious move by the WBO.
We've got a couple of fallers at Light Middleweight with Sirimongkol Singwancha (#10) dropping a couple of places whilst Japanese champion Yuki Nonaka (#12) has dropped a single position.
OPBF Super Middleweight champion Yuzo Kiyota (#14) has crashed back into the rankings as he looked for a second world title shot. Kiyota was unranked last month.
There is no Asian fighter ranked at Middleweight, Light Heavyweight, Cruiserweight or Heavyweight.
(Image courtesy of the WBO)