In what year and location did Wang Liqin win the Mens Singles?
CREATE TABLE "us_open" (
  "year_location" text,
  "mens_singles" text,
  "womens_singles" text,
  "mens_doubles" text,
  "womens_doubles" text
);
SELECT "year_location" FROM "us_open" WHERE "mens_singles"='Wang Liqin';