CREATE TABLE "singles_17" (
  "edition" text,
  "round" text,
  "date" text,
  "against" text,
  "surface" text,
  "opponent" text,
  "result" text
);

Question: What's the date that Morocco has an Against along with a surface of hard?
SQL: SELECT "date" FROM "singles_17" WHERE "against"='morocco' AND "surface"='hard';

Question: What's Round has a Surface of hard and Opponent of Jelena Simic?
SQL: SELECT "round" FROM "singles_17" WHERE "surface"='hard' AND "opponent"='jelena simic';