Of the two men it's Oleydong who is the more well known, by far. The Thai debuted back in 2002 and roose through the ranks quickly, winning the WBC Youth and WBC Asian Boxing Council Minimumweight titles in his third professional bout. In 2007 he beat Omar Soto in a WBC world title eliminator and would then go on to beat Eagle Den Junlaphan for the WBC title a few months later. His reign as the WBC champion saw him record 6 world title defenses, including wins over Muhammad Rachman, Juan Palacios and Pornsawan Porpramook, twice. After compiling a 35-0-1 (13) record Oleydong would travel to Japan and take on a then 6-0 (4) Kazuto Ioka, who stopped the Thai in 5 rounds to claim his first professional title.
Since losing the WBC title Oelydong has gone 32-0, though has faced only a handful of fighters of any note, including Mark Anthony Geraldo, Jason Canoy, Hayato Kimura and Hiroyuki Kudaka, with his last win of note being the Kudaka win back in late 2012. It seemed like his team were going to be guiding him to a second world title fight but his career has seriously tailed off over the last 5 years.
Kiyose on the other hand debuted in 2013 and was the runner up in the 2015 All Japan Rookie of the Year, losing to Matcha Nakagawa in the final. The loss to Nakagawa was Kiyose's second loss and saw his record slip to 7-2-1 (1), since then however he has impressed, going 7-0 (5) and scoring notable wins over Shun Ishibashi, Ryuta Otsuka and Joe Tejones, with the win over Tejones leading Kiyose to become the new WBC Youth Super Bantamweight champion.
This is a huge step up in class for Kiyose, and a chance to Oleydong to prove there is still life left in his 32 year old legs. The bout should be a really good one, with both men fancying their chances, and the winner will likely open the door to some pretty good fights down the line.