Liu Xin and Liu Dingshuo claimed hard-fought wins to take out respective ITTF Brazil Open titles on Sunday.
China's Liu Xin won the women's singles crown with an 11-9 7-11 13-11 11-6 7-11 11-6 victory over countrywoman Zhu Chaohui.
The left-hander said her return of serve was the key after she also took out the under-21 women's singles title.
"I do think that playing in two ITTF World Tour tournaments has helped me to prepare better to receive service," she said.
"Both events have been of a high level, it's been a real challenge and playing against foreign players you must be really strong mentally.
"It's not easy, it's been a really good experience."
In the men's singles final, Brazilian Gustavo Tsuboi was beaten by Liu Dingshuo.
The local went down 13-11 8-11 11-3 14-16 11-8 13-11 on what was a good day for China.