CREATE TABLE table_12268 ("Draft" FLOAT, "Round" TEXT, "Pick" FLOAT, "Player" TEXT, "Nationality" TEXT)

What is the lowest draft of player justin martin from the USA?
SELECT MIN("Draft") FROM table_12268 WHERE "Nationality" = 'usa' AND "Player" = 'justin martin'
SELECT MIN("Draft") FROM "table_12268" WHERE "Nationality" = 'usa' AND "Player" = 'justin martin'