By Radio Rahim

Hall of Fame trainer Freddie Roach was not satisfied with Saturday's performance by Manny Pacquiao.

The Filipino star returned for the first time since his April trilogy win over Timothy Bradley, and he captured the WBO welterweight champion Jessie Vargas with a dominating twelve round unanimous decision at the Thomas & Mack Center in Las Vegas. 

Pacquiao started slow and quickly changed the tempo when he dropped Vargas in the second round with a sharp left hand counter. He controlled most of the fight, but never pressed for a knockout or threw more than a handful of punches at a time.

Prior to the fight, Roach believed that Pacquiao's killer instinct had come back, but now he's not so sure. Pacquiao had Vargas stunned during other moments in the fight and never applied the pressure to do more damage. Even after the knockown, Roach felt Pacquiao let Vargas off the hook.

"I'm not sure yet [if his killer instinct is back]. I have to analyze that a little bit more, because I think after that fist knockdown maybe he didn't want to hurt the guy. He had more opportunities [to hurt Vargas]. He hurt him a few more times in the fight and didn't press it as hard as he could have. I have to figure that out and we have to talk a little bit about that," Roach told BoxingScene.com.

Roach did praise Vargas for his tough mentality and being able to last through the full distance. He expects Vargas to bounce back in a very loaded welterweight division.

"Every time he got hit he fought back. He's a really tough kid. He landed a few good right hands. He fought a decent fight. He wasn't embarrassed or anything. He was a game kid the whole way through," Roach said.