CREATE TABLE table_9191 ("Date" CLOB, "Tournament" CLOB, "Surface" CLOB, "Partner" CLOB, "Opponents" CLOB, "Score" CLOB)

What type of surface was played on July 27, 2013?
SELECT "Surface" FROM table_9191 WHERE "Date" = 'july 27, 2013'
SELECT "Surface" FROM "table_9191" WHERE "Date" = 'july 27, 2013'