Duane Paul Ludwig (born August 4, 1978) is an American mixed martial arts coach, retired professional kickboxer and mixed martial artist. Ludwig formerly held the unofficial fastest knockout record in the UFC after his win against Jonathan Goulet (in 0:06) at UFC Fight Night 3. Ludwig was regarded as a top lightweight in the world during 2003 and 2004, for his victories over Jens Pulver at UCC 12 and Genki Sudo at UFC 42, up until a loss to B.J. Penn at K-1 MMA: Romanex.
https://en.wikipedia.org/wiki/Duane_Ludwig