That stumbling block is Filipino Gretchen Abaniel (13-4, 4) who challenges Japan's WBA champion Ayaka Miyao (15-5-1, 1) for the WBA title on November 28th.
Abaniel, who comes in to this bout highly regarded and with the reputation of hitting harder than her record indicates, is a real banana skin for someone like Miyao.
Aged 28 and stood at 5'1" the Filipino challenger is younger, taller and rangier than the champion. As well as those physical advantages she has proven to be a credible world level fighter having previously shared a ring with Cho-Rong Son, Samson Tor Buamas, Katia Gutierrez and Teeraporn Pannimit.
Whilst Abaniel is 0-3 is world title fights recognised by "the big four" she has previously won a secondary title, the WIBA Minimumweight title, suggesting she has the ability to be a world champion in the future and in all honesty "on her day" she could possibly beat anyone at 102lbs.
Japan's Ayaka Miyao is, at 30 years old, probably coming into the later years of her prime physically. Whilst some female fighters have managed to find success in their later years, such as Naoko Fujioka who is almost 40 yet looks to still be improving, it's fair to say most are beginning to slow by their 30's, especially in in the smaller divisions.
Although not a big puncher Miyao has proven to be tough, talented and a fighter who has improved massively since she began her career. Saying that it is worth noting that Miyao began her career 4-4-1 before going 11-1 in her following 12 as she went from talented but inexperienced fighter to world champion.
Those 12 fights that Miyao has fought in since her poor start have included 8 straight victories. These have seen her claiming the WBA Atomweight title and subsequently defending it twice and she's become another notable member of the Ohashi stable which also over-sees the careers of Naoya Inoue and Akira Yaegashi.
For us this bout comes down to two things. Can Miyao get the respect of Abaniel with her light punching? If she can't, does she have the skills to out boxing Abaniel?
We feel that Miyao won't be able to get Abaniel's respect but will have the skills to win enough rounds to win a decision. It won't be decisive and dominant but the right woman will win for use. Thankfully for Abaniel we don't think this will be her last chance.
Of course no matter who wins we would love to see the winner fighting Koseki in a major unification bout. It would, of course, be bigger if it was an All-Japanese bout though even if it wasn't it would still be a major bout and the most important in the Atomweight division's history.
Note-This bout is the headline contest from Ohashi gym's "47th Battle Phoenix" which also features a contest between Kayoko Ebata and Nancy Franco.