CREATE TABLE table_203_198 (id DECIMAL, "season" TEXT, "series" TEXT, "team" TEXT, "races" DECIMAL, "wins" DECIMAL, "poles" DECIMAL, "fast laps" DECIMAL, "points" DECIMAL, "pos." TEXT)

what was the first series in 2001 ?
SELECT "series" FROM table_203_198 WHERE "season" = 2001 ORDER BY id LIMIT 1
SELECT "series" FROM "table_203_198" WHERE "season" = 2001 ORDER BY "id" NULLS FIRST LIMIT 1