CREATE TABLE table_48233 ("Date" TEXT, "Series" TEXT, "Circuit" TEXT, "City / State" TEXT, "Winner" TEXT, "Team" TEXT)

WHAT IS THE WINNER WITH ATCC ROUND 6?
SELECT "Winner" FROM table_48233 WHERE "Series" = 'atcc round 6'
SELECT "Winner" FROM "table_48233" WHERE "Series" = 'atcc round 6'