Masahura kawakami, Joves De La Puz and Joko Arter all debuted in 15 rounds world title fights. Domingus Siwalette and Arturo Mayan both debuted in 12 rounds world title fights. Charlie Goldman is of course best known for being the trainer of Rocky Marciano, but was himself a veteran of more than 150 pro fights in early 20 century - where he, at the age of 16, debuted in a fight that was declared a draw after 42 rounds!