CREATE TABLE table_80216 ("Rank" FLOAT, "Heat" FLOAT, "Lane" FLOAT, "Name" TEXT, "Nationality" TEXT, "Time" TEXT)

Name the least lane for kasey giteau and rank less than 18
SELECT MIN("Lane") FROM table_80216 WHERE "Name" = 'kasey giteau' AND "Rank" < '18'
SELECT MIN("Lane") FROM "table_80216" WHERE "Name" = 'kasey giteau' AND "Rank" < '18'