CREATE TABLE table_17368 ("Year" FLOAT, "Division" TEXT, "League" TEXT, "Reg. Season" TEXT, "Playoffs" TEXT, "Open Cup" TEXT)

What playoff result happened during the season in which they finished 1st, southern?
SELECT "Playoffs" FROM table_17368 WHERE "Reg. Season" = '1st, Southern'
SELECT "Playoffs" FROM "table_17368" WHERE "Reg. Season" = '1st, Southern'