Whose Runner-up has a Semifinalist of guillermo pérez-roldán andrea gaudenzi?
CREATE TABLE "september" (
  "week_of" text,
  "tournament" text,
  "champions" text,
  "runners_up" text,
  "semifinalists" text
);
SELECT "runners_up" FROM "september" WHERE "semifinalists"='guillermo pérez-roldán andrea gaudenzi';