what's the doubles w-l with years played value of 1 (1968)
CREATE TABLE "squad_members" (
  "player" text,
  "years_played" text,
  "total_w_l" text,
  "singles_w_l" text,
  "doubles_w_l" text
);
SELECT "doubles_w_l" FROM "squad_members" WHERE "years_played"='1 (1968)';