Nick Young -- Threatens ESPN Reporter ... Over Iggy Diss

Nick Young might not be making "SportsCenter's" top plays anytime soon ... 'cause the Lakers star just threatened an ESPN anchor after the guy dissed his GF Iggy Azalea on the air.

For some reason, ESPN anchor Robert Flores fired a shot at Iggy during a segment called, "What Did We Learn?" ... saying:

"We learned that according to the Lakers' Nick Young a dolphin recently tried to kill him. So Nick while dolphins are trying to kill you, your girlfriend is trying to kill hip hop ... let's call it even, ok?"

Needless to say, Swaggy P was PISSED and tweeted to Flores to let him know he's got a problem:

"@RoFloESPN I'm pretty sure we going to run into each other soon."

Sounds like a threat. But Nick didn't stop there ...

"You job is to talk about sports not what me and my chick got going on," Young wrote ... adding, "so we got a problem."

ESPN and Flores have yet to comment about the situation.

This isn't the first time Nick has sprung to Iggy's defense on social media ... he publicly took Snoop Dogg to task for dissing Iggy last year, and things were tense until Iggy's boss T.I. stepped in and squashed that beef.

Robert, if you know any huge rappers that owe you a favor ... now might be the time.