CREATE TABLE "september" (
  "week_of" text,
  "tournament" text,
  "champions" text,
  "runners_up" text,
  "semifinalists" text
);

Question: Which Semifinalists has a Champions of michael chang 6-0 6-4?
SQL: SELECT "semifinalists" FROM "september" WHERE "champions"='michael chang 6-0 6-4';

Question: Whose Runner-up has a Semifinalist of guillermo pérez-roldán andrea gaudenzi?
SQL: SELECT "runners_up" FROM "september" WHERE "semifinalists"='guillermo pérez-roldán andrea gaudenzi';