The biggest fight of their lives is looming on the horizon and boxing coach Freddie Roach admitted that he and the rest of Manny Pacquiao's team are feeling the pressure.

But for the ring tactician, the pressure is even heavier on Floyd Mayweather Jr., who has built an image of invincibility with his immaculate boxing record.

"We do feel more pressure than usual. But I think the real pressure is on Floyd. That ‘0’ means more to him than anything, it's his identity,” Roach told USA Today prior to Zou Shiming’s bout in Macau over the weekend.

Mayweather is unbeaten in 47 fights, although some of his victories were controversial.

Roach believes it will be harder for Mayweather to maintain the streak late in his career, noting that he turned 38 last February and that his age is showing in his previous bouts.

“The further along he goes with each fight, the heavier the pressure is on him. It's not unlike pitching a no-hitter. It's a breeze the first few innings, but in the late innings? You have to really bear down and you aren't as fresh and comfortable as you were earlier. Things creep into your mind,” he said.

Part of their strategy is to take Mayweather out of his comfort zone.

"He hates that. We have already done that by making him fight Manny. He never wanted that fight. Manny and the fans forced him to take the fight. He ran out of road. His excuses no longer held water. The next step is to take the fight to him on May 2,” he said.

The other part of their plan is to have Pacquiao dictate the tempo of the fight as early as the first round.

“Manny winning that first round is critical. And Manny winning that fight will be a public service for boxing," said Roach.

Meanwhile, Roach denied talk that Pacquiao will be hanging his gloves after the Mayweather bout, saying the fighting congressman will likely fight a couple more times, win or lose against “Money May.”

The coach even believes Pacquiao might keep on boxing until he becomes eligible to run for president.

"I don't think so because he's so good at boxing," said Roach. "I think he wants to (eventually) become the president of his country, and I think he'll be old enough in a couple of years."

The Philippine Constitution mandates that presidential candidates should be at least 40 years old.

Pacquiao who is born on December 17, 1978, is 36 years old.