The weigh-in went down in Miami ... the prelude to the pay-per-view match which goes down Sunday night in Miami Gardens.
Logan Paul weighed in at 189.5 pounds ... barely under the maximum of 190. Mayweather came under the 160 lb limit at 155. There's also a 6-inch height difference in favor of Logan.
Logan entered to “Sweet Child O’ Mine” by Guns N' Roses. He said his presence “proves this sh*t is a simulation.” And then, he went on ... “None of it’s real. The aliens are coming in June. Just be ready. Tomorrow, I break the f***ing simulation and beat the greatest boxer in the history of the planet.