Fa's win in Ohio in front of his influential promoter Lou DiBella came after only 67 seconds and left Latham, who had been backed into a corner, in a bad state.
The trouble for the previously undefeated Latham began almost immediately when Fa scored with a beautifully-timed one-two which backed his opponent against the ropes and the New Zealander wasted little time in taking advantage of his dominance.