Jussie Smollett 'Attacker' Abel Osundairo Meets Floyd Mayweather

One of Jussie Smollett's alleged "attackers" is on a roll -- shortly after starring in his first movie ... he's hanging out with one of the biggest celeb athletes in the world.

Abel Osundairo met up with Floyd Mayweather this weekend at the undefeated fighter's gym in Las Vegas ... then hit up his club later on for more face time with the boxing champ.

We broke the story ... Abel's been training with Floyd's renowned trainer, Nate "The Snake" Jones, in order to advance his own promising boxing career after winning a title in Chicago's Golden Gloves tourney in April -- a fight that wasn't staged!

We're told Abel's preparing to give it a shot at the 2020 Summer Olympic Games in Tokyo -- representing his home nation, Nigeria -- and meeting with Money Mayweather should provide a ton of inspiration.

The Osundairo bro isn't just succeeding in boxing either ... he's on the up and up in the showbiz world too. We broke the story ... he landed the lead role in the low-budget film, "Friends Family & Lovers," directed and cowritten by the guy who also cowrote the Master P produced comedy "I Got the Hook-Up 2."

It didn't earn any Golden Globes noms or anything ... but still. Ever since being linked to Smollett's "hate crime" in Chicago on that bitter, cold night in January ... Abel's been heating up.

Can't say the same for Jussie.