CREATE TABLE table_35912 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Stadium" TEXT, "Record" TEXT, "Attendance" FLOAT)

What opponent has balboa stadium as the opponent?
SELECT "Opponent" FROM table_35912 WHERE "Stadium" = 'balboa stadium'
SELECT "Opponent" FROM "table_35912" WHERE "Stadium" = 'balboa stadium'