Lil Wayne wants his bling, bling back -- claiming NBA player Frank Mason ditched his Young Money sports agency ... and refuses to give back his YM chain.
Backstory ... Mason signed to Weezy's Young Money APAA Sports Group back in April 2017 ... right before the NBA Draft (he was selected in the 2nd round by the Sacramento Kings).
As part of the deal, YM says it advanced Mason $40,000, agreed to pay his pre-draft expenses (totaling $52k) and hooked him up with an $11,000 diamond Young Money chain.