The heavy handed champion won the title earlier this year, when he blasted through Shota Hayashi in 3 rounds. Sadly though he has been inactive since that win, which came all the way back in April, he has been out of the ring and not managed to really build on that win. Although the momentum has cooled a little it should be noted that the win over Hayashi was Saka's 8th straight stoppage and continued a run that also included wins over Ryuto Kyoguchi, Burning Ishii and Takafumi Nakajima. That run has seen Saka go from 8-3 (5) to 16-3 (13) and break into the world rankings as well as become the Japanese champion.
Technically Saka is a bit “rough around the edges” as much pure punchers are, but his brute power is a real threat to everyone on the domestic scene, as his win over Hayashi showed. He's aggressive from the word go and looks to take opponents out early, with 10 stoppage in the first 3 rounds. In bouts that have gone beyond 3 he is 6-3 (3) and arguably the biggest question mark about him is his stamina, thanks in part to a 9th round TKO loss to Hiroshige Osawa.
Whilst Saka has been in great form and genuinely impressed with recent results the same can't really be said of Ohashi, who is a bit of an unknown with mixed results and no out and out standout win. He stated his career with 5 straight wins before being blown out in a round by Coach Hiroto in 2010 A second short winning run was ended by another stoppage, as Tatsuya Takahashi stopped him in 3 rounds in 2012. Since the start of 2013 Ohashi has gone 5-1-2 (3) but suffered his third stoppage loss, to Tsuyoshi Tameda, and draws with Yosuke Kawano and Mikihito Seto, two fights some distance removed from a domestic title fight.
In the ring Ohashi is a rather basic fighter, he's slow and clumsy and looks like a fighter who lacks any form of snap. He must have naturally heavy hands, but there is little to really be impressed by. Despite 3 stoppages he can take a decent shot, at least at the lower domestic level, and there is a bit of an awkwardness about him, but the reality is that he's a weak challenger for Saka.
Given Saka's break from the ring it was clear he wasn't going to be tossed in with a really good fighter, but the reality is that this should be little more than another blow out win for one of Japanese boxing most exciting domestic champions.