Terence Crawford (right) hits Viktor Postol during their WBC-WBO junior welterweight title unification boxing bout in Las Vegas on Saturday. Photo: IC

Unbeaten Terence Crawford punched his way to a lopsided 12-round unanimous decision over Viktor Postol on Saturday to unify the World Boxing Organization (WBO) and World Boxing Council (WBC)  junior welterweight world titles.

Crawford, who improved to 29-0 with 20 knockouts, dropped Postol twice in the fifth round to seize control of the bout at the MGM Grand Garden Arena in Las Vegas, with two judges scoring it 118-107 for the American and the third seeing it 117-108.

In handing Postol his first defeat in 29 fights, Crawford not only added the Ukrainian's WBC belt to his own WBO title, he put himself in line for a potential date with Manny Pacquiao in the Filipino's return to the ring likely later this year in Las Vegas.

"It's whatever," Crawford said of a possible fight with Pacquiao. "I let my coaches handle that. I'm a fighter. I'll fight anybody. I'm looking forward to the biggest and best fights to get me to that next level."

Crawford, 28, was content to feel Postol out over the first three rounds, before landing a series of damaging lefts in the fourth.

He had Postol's knee on the ­canvas in the opening seconds of the fifth round with a right hook, and sent him down again in the same round with another left.

As Postol struggled to deal with Crawford's quick, erratic movement, the American won round after round, staggering Postol again in the ninth.

Postol tried to pour it on in the 12th, but Crawford didn't yield.

"I just stick to what I knew - boxing," Crawford said. "They say he's got the best jab in my division, I proved different today."

On the undercard, unbeaten Oscar Valdez stopped previously unbeaten Matias Rueda in the second round to claim the vacant WBO featherweight world title.

Mexico's Valdez, a two-time Olympian who improved to 21-0 with 18 knockouts as a professional,

staggered Rueda in the first round and dropped him twice in the second with body shots - with Rueda failing to rise the second time. Rueda fell to 26-1 with 23 knockouts.

"This was my dream since I was 8 years old," said Valdez. "It is the dream we shared, me and my father. I just work hard in the gym. We got to accomplish our dream. Now I want to fight the best."

Valdez won the title vacated by Ukraine's Vasyl Lomachenko, after he moved up in weight and won the WBO super featherweight world title in just his seventh pro bout.