What surface was used when she played with Remi Tezuka?
CREATE TABLE "doubles_18_7_11" (
  "outcome" text,
  "date" text,
  "tournament" text,
  "surface" text,
  "partner" text,
  "opponents" text,
  "score" text
);
SELECT "surface" FROM "doubles_18_7_11" WHERE "partner"='remi tezuka';