China underlined their table tennis supremacy on Wednesday by taking both the boys' and girls' world junior team titles with the loss of only one match.
The Chinese girls dropped just one game for a comfortable 3-0 victory over Japan while Ma Long notched up two wins to take the boys past South Korea 3-1.
Ma outgunned Lee Jin-kwon 13-11, 11-6, 11-7 in the opener and Cho Eon-rae 13-11, 11-8, 11-5 in the final rubber, while Zhou Bin shot down Yeo In-ho 11-8, 11-9, 11-4 in the third.
The only blip came when Li Hu, who beat Cho in the boys' singles final last year, lost out to his South Korean rival in the second rubber.
In the girls' final, Chang Chenchen fended off Japan's Ai Fukuhara, who reached the last 16 in the Athens Olympics, to win the opening rubber 11-7, 11-6, 11-8.
best of five
Fan Ying saw off early pressure from Nozomi Hasama to win 9-11, 11-2, 11-5, 11-5, and Liu Shiwen completed the victory by beating Yuka Ishigaki 11-7, 11-4, 11-5 in the best-of-five final.
Earlier in the day, Daniela Dodean scored two wins to lead Romania to a 3-2 victory over South Korea for third place in the girls' event, while hosts Japan took third place in the boys' competition with an inspired 3-1 win over a strong Germany team.
China took six out of seven titles in the inaugural championships in Santiago, Chile, last year.