Ever wonder what happened to prospects that just stopped? Well, here is one: Melvin Cumba
Racked up a decent 10 fight, 5 ko undefeated streak from 1998 to 2005- with some missing years he did not fight. Didn't fight at all in 2001, 2002 or 2004: Melvin Cumba - Boxer
Well, he has drug and prison problems:
2009 Heroin arrest: Massachusetts Man Arrested After Shooting Heroin In Supermarket Bathroom — Massachusetts Criminal Defense Attorney Blog
Currently: Booked on petty theft and drug related charges: Melvin Roberto Cumba's Record Orange County, FL - 10/12/2014
Most likely he had a series of years like this.
See one of his fights:
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