Ryan Garcia is picking a side amid 50 Cent's longstanding beef with Diddy ... publicly asking the "In Da Club" rapper to walk him out for his fight against Devin Haney.
50 has been having a field day as Diddy faces sexual misconduct allegations and a federal sex trafficking investigation ... constantly posting memes and jokes at his nemesis' expense.
Garcia has also done trolling of his own ... training in a shirt that showed Haney standing shirtless in a pool with Diddy and speculating whether "The Dream" has been involved in any alleged wrongdoing.