On the undercard, Colombian Cesar Canchila outpointed Giovanni Segura to claim the WBA interim light-flyweight championship.
In the flyweight final, Ren will face Britain's Nicola Adams, who defeated five-time world champion M.
WSJ: 2012 London Olympics: Shields Gives U.S. Shot at Boxing Gold
Russian Misha Aloian and Brit Andrew Selby are the top two seeds in the men's flyweight tournament.
Earlier on Saturday another British boxer went out, with flyweight Khalid Yafai well beaten by Cuban Andris Hernadez Laffita.
The light-flyweight's father Patrick Senior says the money issue has put "a lot of pressure" on the Olympic Games contender.
Indeed, Roel is the man to beat for the light-flyweight (up to 48 kilos) title at the Asian Games in Bangkok.
At the 1996 Games in Atlanta, he lost to Bulgaria's Daniel Petrov in the final match of the light flyweight division.
He returned to win the British super-bantamweight title having previously been a British champion at flyweight, as well the Commonwealth title-holder.
But all eyes in China will be on Mr. Zou, who fights in the flyweight class, which is between 108-112 pounds.
WSJ: 'Fists of Gold' Zou Shiming Boxing Match Fires Up China
However, there was disappointment for Liverpool light-flyweight Tommy Stubbs, who was comfortably beaten 8-1 by Belfast's Beijing bronze medallist Paddy Barnes.
On the undercard, champion Jorge Arce retained the WBC light flyweight title with a third-round technical knockout of Mexican compatriot Augustin Luna.
Liverpool light-flyweight Tommy Stubbs beat Lithuania's Marius Vysnuiaukas 9-3 on Saturday to set up a last-eight meeting with Belfast's Beijing Olympic medallist Paddy Barnes.
Sitting beside former Olympic silver medallist Amir Khan, Mr Cameron watched as Britain's Nicola Adams made her way into the flyweight final of the women's boxing.
Pacquiao, who started life as a flyweight, will no doubt fight the winner of the bout between Floyd Mayweather Jr and Juan Manuel Marquez on 18 July.
At the 1996 Olympics, Roel gained a few kilos to move into a heavier division rather than slug it out with his baby brother for the light-flyweight title.
Flyweight Yafai, who received a bye into the second round in Beijing, was always trailing and struggled to impose himself on the fight as he slipped to a 9-3 defeat.
Eighteen-year-old Gamal Yafai, younger brother of 2008 Olympian and flyweight Khalid, gave a mature performance in beating Italian Vittorio Parrinello 5-3 in his second-round bout, having seen off Israel's Peter Moyshenzon 11-1 on Saturday.
Earlier Wednesday, Marlen Esparza earned a bronze medal in the 51-kilo flyweight category but narrowly failed to reach the gold-medal fight after a 10-8 semifinal loss to China's Ren Cancan, the world No. 1 and top seed.
WSJ: 2012 London Olympics: Shields Gives U.S. Shot at Boxing Gold
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