CREATE TABLE table_44688 ("Tournament" TEXT, "Surface" TEXT, "Week" TEXT, "Winner and score" TEXT, "Finalist" TEXT, "Semifinalists" TEXT)

On what surface did they play the match in the week of October 21?
SELECT "Surface" FROM table_44688 WHERE "Week" = 'october 21'
SELECT "Surface" FROM "table_44688" WHERE "Week" = 'october 21'