Which runner-up has a 10 strokes margin of victory?
CREATE TABLE "epd_tour_6" (
  "date" text,
  "tournament" text,
  "winning_score" text,
  "margin_of_victory" text,
  "runner_up" text
);
SELECT "runner_up" FROM "epd_tour_6" WHERE "margin_of_victory"='10 strokes';