What were the quarterfinals in the round of 32 was  S williams / V williams ( usa ) l 6–4, 5–7, 1–6?
CREATE TABLE "table1_17289604_38" (
  "athlete" text,
  "event" text,
  "round_of_64" text,
  "round_of_32" text,
  "round_of_16" text,
  "quarterfinals" text
);
SELECT "quarterfinals" FROM "table1_17289604_38" WHERE "round_of_32"='S Williams / V Williams ( USA ) L 6–4, 5–7, 1–6';