For Kakutani this bout will come almost 18 months after his only previous world title bout, a 4th round TKO loss to Adrian Hernandez. Incidentally that was also his only previous bout outside of his native Japan. Although Kakutani came up short short against Hernandez he did manage to surprise the then WBC Light Flyweight champion, dropping Hernandez in the opening round, and was later used by Naoya Inoue to help the "Monster" prepare for his bout with Hernandez.
Kakutani isn't particularly well known outside of Japan but the Kanazawa fighter has mixed in decent company with the loss to Hernandez being his most notable bout. He has also come up short against Warlito Parrenas, in a very interesting 1 round bout, and Teiru Kinoshita, in a Japanese Super Flyweight title bout, though does hold a now impressive looking win over Rey Loreto.
For Guevara this is his second successive bout against a Japanese fighter, following his win over Yaegashi, and will serve as his first world title defence. Notably he himself lost in his first world title challenge, losing a decision to the then IBF Light Flyweight champion Johnriel Casimero, though has won 6 straight since then.
Naoya Inoue backed to win by Adrian Hernandez's former foe