SELECT COUNT(womens_doubles) FROM table_28138035_6 WHERE womens_singles = "Li Ju" AND mens_singles = "Wang Liqin"
Berapa kali Li Ju memenangkan single wanita dan Wang Liqin memenangkan single mens?
CREATE TABLE table_28138035_6 (womens_doubles VARCHAR, womens_singles VARCHAR, mens_singles VARCHAR)