Which fighter holds the record for winning a world title after the least fights?

[Bill Paxtom]

Saensak Muangsurin

'The Shadow of the Devil' from Thailand.

Won the WBC Light-Welterweight Title in his 3rd-Bout on July 15, 1975 by scoring
a {KO 8} over WBC Champion - Perico Fernandez.

Was 2-0-0 {2 KO's}, and only had 8-Rounds of Professional Boxing under his belt,
when he walked into the Ring as the Challenger.

A super fantastic southpaw, who could punch non-stop for the entire bout. A vicious
puncher with the straight left-hand

Was great, but suffered a 'bad' eye injury in April 1978, and was affected by poor vision
in his right-eye. Was not the same after that.

Wanted to retire, but foolishly fought on.