https://www.gamespot.com/articles/e3-2018-original-metal-gear-actor-is-the-voice-of-/1100-6459771/

During its E3 2018 Direct, Nintendo announced that all the characters to ever appear in a Smash Bros. game will appear in Super Smash Bros. Ultimate. That includes, of course, Metal Gear Solid's Snake, and now we've learned David Hayter, who has voiced Snake in most Metal Gear games, will be stepping into the role once again.

In an interview with Gameinformer, Nintendo localization manager Nate Bihldorff said Hayter would be providing Snake's voice. Hayter himself then confirmed the announcement on Twitter.