On Saturday, July 4, at 5:30am EDT, the WWE Network is showing a 2 hour event from Japan. Several WWE stars will be there, including Brock Lesnar and the NXT champion, Kevin Owens. I'll be watching, but not live, so have set it up to record.
Looks like Dolph Ziggler and John Cena will be there, but not sure who else. There's also a few well-known Japanese wrestlers, but I'm not familiar with any of them. If you do a search on WWE Japan, there's a few articles about it.
Wrestling is huge in Japan. There are a few Japanese wrestlers here, but mostly in NXT. Yeah, WWE has had its share of Sumo wrestlers in the past, but it's been a long time since they've done it.
In 1976, I remember when Muhammad Ali had a fight against Antonio Inoki, a very famous Japanese wrestler at the time. Here's a Wiki link: https://en.wikipedia.org/wiki/Muhammad_Ali_vs._Antonio_Inoki#The_fight
I'm guessing any of the Sumo guys would have been too much for Ali. Sumos seem to devote their whole lives to the sport and take it very seriously.
The Japan event was kind of disappointing. The only real interesting match was the NXT champ Kevin Owens losing his title. The match that really surprised me was Brock Lesnar taking on Kofi Kingston. Give me a break. Talk about boring and the obvious outcome. Hint: the loser's initials were KK.