when womens singles is wang yihan and tour is french super series, what were the men's singles?
CREATE TABLE "winners" (
  "tour" text,
  "mens_singles" text,
  "womens_singles" text,
  "mens_doubles" text,
  "womens_doubles" text,
  "mixed_doubles" text
);
SELECT "mens_singles" FROM "winners" WHERE "womens_singles"='Wang Yihan' AND "tour"='French Super Series';