When the hell is someone gonna give Floyd Mayweather a run for his money??
That's what Kevin Hart wants to know ... who tells TMZ Sports Floyd's opponents simply don't have what it takes to test the champion.
Hart -- who was in Vegas to watch Floyd dominate Marcos Maidana (again) this weekend -- told us Floyd's domination reminds him of another legendary fighter ... himself.
Check out the clip -- and listen to Kevin talk about how he CRUSHED people back when he was 7.