In which year did Sun Yingsha and Xu Xin play mixed doubles?

20 19. According to the inquiry of China Sports official website, in the mixed doubles final of 201912 German Open, Xu Xin and Sun Yingsha won the mixed doubles championship for the first time. At the beginning of 2020, Xu Xin/Sun Yingsha fought to the end and won the mixed doubles championship in the Surface 12 competition. So Sun Yingsha and Xu Xin played mixed doubles on 20 19.