The bout may not have been as high profile as Pacquiao's though was just exciting, in fact it was arguably a better bout with a more competitive feel to the action and a lot more blood.
Masuda got off to a great start piling up the early rounds round before he was cut from an accidental headclash in round 6. This cut seemed to slow his momentum and allowed Kawaguchi a chance to fight his way back in to the bout as the fight began to swing from one side to another.
It was the blood that eventually saw the bout coming to a slightly premature ending, though the men were into the 10th and final round, when the doctor finally said that enough was an enough and took us to the score cards with less than a round to go.
The judges, like many, had felt Masuda's early work was the difference and awarded him the clear decision with the scorecards reading 96-93, 96-92, 96-92 all in favour of Masuda.
For Masuda this was his 5th straight victory following his loss in 2012 to Ryosuke Iwasa, in a bout for this very same title. Kawaguchi on the other hand sees a 7 fight winning streak come to an end with his first loss since a 2010 defeat at the hands of Yasutaka Ishimoto
(Photo courtesy of boxingnews.jp)