CREATE TABLE table_203_644 (id DECIMAL, "pos." DECIMAL, "driver" TEXT, "co-driver" TEXT, "car" TEXT, "time" TEXT, "difference" TEXT, "points" DECIMAL)

who finished with the least time ?
SELECT "driver" FROM table_203_644 ORDER BY "time" LIMIT 1
SELECT "driver" FROM "table_203_644" ORDER BY "time" NULLS FIRST LIMIT 1