What is the highest sd when the status is second round lost to iveta benešová?
CREATE TABLE "women_s_singles" (
  "sd" real,
  "rk" real,
  "player" text,
  "points" real,
  "points_defending" real,
  "points_won" real,
  "new_points" real,
  "status" text
);
SELECT MAX("sd") FROM "women_s_singles" WHERE "status"='Second round lost to Iveta Benešová';