Eizumi holds a 15-16-3 record, but he's a lot better than his record suggests, and a lot of his losses have come against great fighters like arguable-strawweight GOAT Mitsuhisa Sunabe, other-arguable strawweight GOAT Rambaa Somdet, Noboru Tahara, Hiroyuki Abe, Masakazu Utsugi, Shoko Sato, Kiyotaka Shimizu, Isao Hirose, Macho the Butterfly, and, most recently, Shinya Murofushi. Just about all of those guys have either been a Pancrase or Shooto champion or were ranked between the top-3 and top-15 at flyweight or strawweight at at least one point. He also holds solid victories over former-top-5 flyweight Yusei Shimokawa, Takehiro Ishii, Isao Hirose, 2008 Neo-Blood tournament winner Ryota Sasaki, and Takamasa Kiuchi. At 67%, he's got a high finishing rate for the lower weight-classes, but the real interesting thing is that he won 9 of his first 10 victories by knockout, so he's a strong fighter who has knockout power, which counts for a lot more at the lower weight-classes.
He's probably best known for the trollface gif that ciruclated around the Internet after his victory over Yusei in 2014.
Oz is another fighter whose record (14-12-7) doesn't reflect his talent, especially considering how many of those fights took place at bantamweight and even featherweight early in his career. He's a veteran, having fought professionally for 15-years, and he's got a few very solid victories. Including over Luciano Azavedo, former top-10 bantamweight Daniel Lima, Isao Hirose, and Ayumu Shioda, and draws with Takafumi Otsuka, Junya Kodo, Kiyotaka Shimizu, and combat wrestling champion Daiji Takahashi. A lot of his losses have also come against good fighters; Daichi Kitakata, Ali Bagautinov, Mitsuhisa Sunabe, Kenji Osawa, Takeya Miz', Yuta Nezu, So Tazawa.
He'll be making his official strawweight debut in this fight, having fought previously in Pancrase's 120-lb junior flyweight division [or did they call it "flyweight" towards the end and call 125 "super-flyweight"?] against Mitsuhisa Sunabe in his most recent fight in 2015.