CREATE TABLE "winners" (
  "year" text,
  "men_s_singles" text,
  "men_s_doubles" text,
  "women_s_doubles" text,
  "mixed_doubles" text
);

Question: What were the names of the mixed doubles pair for the year that Ralph Nichols played in the men's singles match?
SQL: SELECT "mixed_doubles" FROM "winners" WHERE "men_s_singles"='ralph nichols';

Question: Who were the women's doubles pair in 1952?
SQL: SELECT "women_s_doubles" FROM "winners" WHERE "year"='1952';