What is the minimum rnd at Laguna Seca?
CREATE TABLE "table1_27561505_2" (
  "rnd" real,
  "circuit" text,
  "sports_2_0_winning_team" text,
  "sports_2_0_winning_team" text,
  "gt_2_0_winning_team" text,
  "gt_2_0_winning_team" text,
  "results" text
);
SELECT MIN("rnd") FROM "table1_27561505_2" WHERE "circuit"='Laguna Seca';