CREATE TABLE table_35064 ("Res." TEXT, "Record" TEXT, "Opponent" TEXT, "Method" TEXT, "Event" TEXT, "Round" FLOAT, "Time" TEXT, "Location" TEXT)

Which Opponent has the Event of Sengoku 1?
SELECT "Opponent" FROM table_35064 WHERE "Event" = 'sengoku 1'
SELECT "Opponent" FROM "table_35064" WHERE "Event" = 'sengoku 1'