What is Winner, when Week is 8 May, when Semi Finalists is Helena Suková Mary Pierce, and when Runner-Up is Conchita Martínez Patricia Tarabini?
CREATE TABLE "may" (
  "week_of" text,
  "tier" text,
  "winner" text,
  "runner_up" text,
  "semi_finalists" text
);
SELECT "winner" FROM "may" WHERE "week_of"='8 may' AND "semi_finalists"='helena suková mary pierce' AND "runner_up"='conchita martínez patricia tarabini';