By Radio Rahim

Veteran trainer Joel Diaz is very confident that Terence Crawford (32-0, 23 KOs) will defeat IBF welterweight champion Errol Spence (23-0, 20 KOs) - if and when that contest takes place.

The hype is already starting to build for a Crawford vs. Spence showdown in the future.

Spence captured the IBF title last May with a stoppage win over Kell Brook in Sheffield. He made his first defense of the title last Saturday night, when he stopped Lamont Peterson at Barclays Center in Brooklyn, New York.

Spence is now scheduled to make a voluntary defense on June 16th in his hometown of Dallas, Texas. He was recently ordered to make a mandatory defense against Carlos Ocampo of Mexico.

Crawford, a former two division world champion, will go for his third when he makes his welterweight debut in a mandatory fight with WBO world champion Jeff Horn on April 14 at Madison Square Garden in New York City.

Last year, Crawford became the first boxer since Bernard Hopkins to unify all four of the major sanctioning titles when he knocked out Julius Indongo in three rounds to unite the WBO, WBA, WBC, IBF world titles.

Diaz has his own experience with Crawford.

Last year, Crawford beat down and stopped one of Diaz's fighters, Olympic gold medal winner Felix Diaz, in a one-sided contest.

Based on everything he's seen, Diaz believes Crawford will overcome Spence - and likely everyone else at 147.

"Crawford will beat Spence. It will be a great fight. Don't get me wrong, Errol Spence is a great fighter, but Crawford is just another breed. He's a great fighter all the way around. He's a well rounded fighter. He can switch lefty, righty... he has all the confidence, he can read you before you even do something. He's a great fighter," Diaz told

"At the end, Crawford will win that fighter. Even though he's never fought at 147, he's got the build of a 147-pounder."