What were the carpet w-l in 1993?
CREATE TABLE "career_singles_statistics" (
  "year" real,
  "tournaments" real,
  "titles" real,
  "hardcourt_w_l" text,
  "clay_w_l" text,
  "grass_w_l" text,
  "carpet_w_l" text,
  "overall_w_l" text,
  "win_pct" text,
  "year_end_ranking" text
);
SELECT "carpet_w_l" FROM "career_singles_statistics" WHERE "year"=1993;