CREATE TABLE table_51557 ("Date" CLOB, "Opponent" CLOB, "Score" CLOB, "Loss" CLOB, "Record" CLOB, "Arena" CLOB)

Who was the opponent at the Staples Center?
SELECT "Opponent" FROM table_51557 WHERE "Arena" = 'staples center'
SELECT "Opponent" FROM "table_51557" WHERE "Arena" = 'staples center'