That was, of course, Ali Raymi the Minimumweight who not only recorded 21 straight opening round victories but also 21 victories over unbeaten men.
The last of those 21 opening round victories came against Prince Maz and was some what controversial due the end looking some what suspect with the camera suddenly blanking out and the bout ending effectively off camera. Raymi went onto inform us over twitter that Maz had turned his back and quit though the footage certainly didn't show that.
The fight was, at the time, Raymi's longest bout and also the closest he had come to seeing the second round, in fact at 2:58 some supposed that the bout had been ended by the referee to keep Raymi's streak in tact and, just a few weeks later they fought a rematch, in that bout Maz lasted into the 7th round with Raymi who continued his KO streak though saw his opening round streak come to an end. Unfortunately only a small portion of that bout was made publicly availabe.