China's table tennis stars continued their dominance in both the men's and women's singles tournament on Tuesday.
Wang Liqin, Wang Hao and Ma Lin all eased through into the fourth round of the men's competition.
And top-seeded women's trio Zhang Yining, Wang Nan and Niu Jianfeng also booked their places in the next round.
Defending singles and doubles champion Wang had the toughest test of the three women, but came through 4-2 against North Korea's Kim Yun Mi.
World number one Zhang saw off the challenge of New Zealand's Li Chinli, while Niu overcame Germany's Elke Wosik 4-3.
China have won every single women's singles gold since table tennis became an Olympic sport at the 1988 Games in Seoul.
Earlier in the day, Liqin, the 2001 men's world champion, lost his first set against Holland's Trinko Keen, but recovered for a 4-1 win.
World number four Hao beat Germany's Jorg Rosskopf and second seed Ma Lin beat Croatia's Zoran Primorac by the same scoreline.
The Dominican Republic's Lin Ju, ranked 137 in the world, caused the upset of the round when he beat Belgian 12th seed Jean-Michel Saive 4-2.
The 24-year-old is one of 30 Chinese-born players representing other nations at this year's Games.
Lin left China two years ago after failing to break into the national side.
And he will get a chance to prove the national selectors they were wrong when he takes on Hao in the last 16 on Wednesday.
Elsewhere, Hong Kong's world number 34 Ko Lai Chak upset the Czech Republic's 14th seed Petr Korbel 4-3.
And home favourite and eighth seed Kalinikos Kreanga was comprehensively beaten by Sweden's Jorgen Persson, the 1991 world champion, 4-0.