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But Marquez is so frustrated after his latest defeat to the Filipino that he may consider retirement.
"It's the result of the fight that makes me think about retirement," he said after losing in Las Vegas on Saturday night.
"I need to sit down with my family and my camp and make a decision about retiring or continuing in the sport. I'm happy with my performance. I don't know what I needed to do to change the minds of the judges.
"It's hard when you're fighting your rival and three judges too."
Marquez is likely to be offered a fourth fight against Pacquiao after making at least $5 million and more likely near $10 million for Saturday's fight. Pacquiao took home between $22 million and $30 million.
But at this point, Marquez figures even if he knocks out Pacquiao, it might not be enough.
"I believe I need to drop him and if I drop him they are going to pick him up and have him fight again," Marquez said. "I'm frustrated. I'm really, really frustrated."
Marquez said he would not protest the verdict but "I don't think it's correct."
"I thought I won the fight clearly," he said. "I felt like I connected with a lot of solid punches in the fight. I felt so good. I never felt his punches.
"This fight was the biggest of my career," Marquez said. "We wanted them to score this fight the way it happened, not how they scored it.
"It was a robbery. They robbed me," "I won again. What do I need to do for the judges to give me the fight?"
If Marquez does fight again, Roach would like to see him in a rematch against Pacquiao before the WBO welterweight champion considers fighting Floyd Mayweather.
"Marquez has given us problems three times," Roach said. "I think he deserves a rematch first.
"It's a fight I don't want to do again," Roach said, "but I think we have to."
Mayweather’s advisor, Leonard Ellerbe, said on Sunday his man wanted a May 5 fight against the best opponent available.
Pacquiao's team is unlikely to leap into that bout, especially with promoter Bob Arum saying he wants Pacquiao and Marquez to meet again next May.
"Marquez fought a great fight," Roach said. "Manny edged it out in the last two rounds but it was a close fight.
“He has Manny's number. The fight was there for him but he chose to stay in counter-puncher mode."
It was an effective strategy, admitted Pacquiao, who has dominated other opponents without defeat since 2005 but barely escaped losing against Marquez three times.
"He was always backing off, waiting for me to create action," Pacquiao said. "It's not easy to create when he's looking for a good shot. I'm very careful. It's not easy to fight Marquez."
Marquez opened a cut over Pacquiao's right eye that required stitches and kept "Pacman" at bay much of the bout with solid defensive work aided by foot cramps that hit Pacquiao in the fourth round.
"Manny hit him some good shots but nothing great," Roach said. "He was moving into his right hand too much. He started cramping and he couldn't get out of the way. He was getting hit with the returns too much."
