CREATE TABLE table_31901 ("Outcome" TEXT, "Date" TEXT, "Surface" TEXT, "Partner" TEXT, "Opponents" TEXT, "Score" TEXT)

Who was the partner for the game on October 20, 2013?
SELECT "Partner" FROM table_31901 WHERE "Date" = 'october 20, 2013'
SELECT "Partner" FROM "table_31901" WHERE "Date" = 'october 20, 2013'