Women's singles of akvilė stapušaitytė, and a Year of 2010 had what mixed doubles?
CREATE TABLE "past_winners" (
  "year" real,
  "men_s_singles" text,
  "women_s_singles" text,
  "men_s_doubles" text,
  "women_s_doubles" text,
  "mixed_doubles" text
);
SELECT "mixed_doubles" FROM "past_winners" WHERE "women_s_singles"='akvilė stapušaitytė' AND "year"=2010;