CREATE TABLE table_42721 ("Outcome" TEXT, "Date" TEXT, "Surface" TEXT, "Partner" TEXT, "Opponents" TEXT, "Score" TEXT)

What is the Outcome when christophe rochus was partner, on 31 july 2005?
SELECT "Outcome" FROM table_42721 WHERE "Partner" = 'christophe rochus' AND "Date" = '31 july 2005'
SELECT "Outcome" FROM "table_42721" WHERE "Date" = '31 july 2005' AND "Partner" = 'christophe rochus'