Greg La Rosa

It's only been 5 months since a gunman opened fire on Floyd Mayweather's entourage in Atlanta -- wounding his bodyguard -- but cops now tell TMZ Sports the case has essentially gone cold. No arrests. No suspects. No leads. As we previously reported, Floyd and his entourage were returning to the…

Nick Diaz says the Floyd Mayweather shooting was "f*cked up" -- especially because he knows a couple of guys in Floyd's entourage who were in the van during the attack. "That was my boy that got shot I think," Diaz said before sending a message to the guy -- "I hope you feel better, you got shot."…