CREATE TABLE table_70591 ("Date" TEXT, "Opponent" TEXT, "Score" TEXT, "Loss" TEXT, "Attendance" FLOAT, "Series" TEXT)

Can you tell me the Opponent that has the Series of 4-2?
SELECT "Opponent" FROM table_70591 WHERE "Series" = '4-2'
SELECT "Opponent" FROM "table_70591" WHERE "Series" = '4-2'