^^ I agree this is a huge fight, I mean boxing is big in Japan and if I'm not mistaken Murata is only few Japanese who has a belt, the other famous Japanese boxer is Naoya Inoue.
And having this fight in Japan and in New Year, it will really translate into big money.
Remember Floyd having an exhibition years ago that started this whole cross over and exhibition fights? He was offered $9 million for 3 rounds. So there's a lot of money in Japanese market whether boxing or MMA.
Inoue has its name and getting known in boxing because of such explosive and surprising winning fights against known opponents as well but Murata is not familiar to many boxing fans that is why nobody had voted his name based on the poll. Of course, we know the story and winning streaks that GGG had until he got failed to protect his undefeated records against Canelo. That could be his biggest fight and a strong opponent, not Murata. I believe that he goona win this fight as he still has the power despite his age.
One thing that goes positive with Inoue is that he is promoted by one of the best managers/promotional company, Top Rank. That's why he was able to break in the US soil for the last 3 years and made his name already.
As compare to Murata, less fights in the US, although he is the champion, he doesn't have the same exposure as Inoue. But as @mirakal have said, Murata is bigger in Japan, and it's good that the fight are going there so the burden will be on GGG here to win.