Ex-NBA star Nate Robinson raked in more than $2 MILLION for that horrific boxing performance against Jake Paul back in 2020 ... and there's a chance they could run it back!!

That's all according to ESPN's Stephen A. Smith who says he spoke with a source "close to Nate" about what's going on behind the scenes ... and he dropped a ton of very interesting information.

Smith had mentioned Robinson's ill-fated Nov. 2020 match with Paul on Monday's "First Take" ... and when they came from commercial break, the extremely well-connected Stephen A. read a text message he received from a trusted Nate Robinson source. Here's what it said: