While there are a handful of real life wrestlers, likely playing themselves or characters close to their WWE and NXT personas, the actor who plays Leo, Seth Carr, is not a wrestler in real life. He is, however, already an accomplished actor at just 13 years old. Before this, he appeared in the shows Ray Donovan, Superstore, and Brooklyn Nine-Nine and was young Killmonger in Black Panther.
Seth also had a regular role on the Amazon Prime crime drama Bosch and had a main role in the short-lived Nickelodeon series Knight Squad. Obviously, the kid is going places and it makes sense for his next step to be a Netflix movie that will undoubtedly gain a lot of traction among subscribers who are already WWE stars and need a wholesome take on the whole thing to enjoy it with their kids.
Source : https://www.distractify.com/p/wwe-wrestlers-in-the-main-event-netflix