What is Score, when Opponent Team is Belgium, and when Opponent is Kirsten Flipkens?
CREATE TABLE "singles_7_4_3" (
  "outcome" text,
  "edition" real,
  "round" text,
  "opponent_team" text,
  "surface" text,
  "opponent" text,
  "score" text
);
SELECT "score" FROM "singles_7_4_3" WHERE "opponent_team"='belgium' AND "opponent"='kirsten flipkens';