Better get to your seats early for the Nick Young vs. Blueface boxing match later this month ... 'cause Swaggy P tells TMZ Sports the fight is going to be over in a matter of seconds!!
The ex-Lakers star made the prediction to us out in L.A. earlier this week ... saying it'll only take him about 15 ticks to knock out the "Thotiana" rapper.
Nick said he's confident for a myriad of reasons ... but explained he believes Blueface's lifestyle is ultimately why he'll dump the 25-year-old in Round 1.