CREATE TABLE table_61899 ("Year" FLOAT, "Edition" TEXT, "Round" TEXT, "Date" TEXT, "Location" TEXT, "Surface" TEXT, "Against" TEXT, "Opponent ( s ) " TEXT, "Score" TEXT, "Result" TEXT)

Which Surface has an Opponent(s) of anna-lena gr nefeld tatjana malek?
SELECT "Surface" FROM table_61899 WHERE "Opponent(s)" = 'anna-lena grönefeld tatjana malek'
SELECT "Surface" FROM "table_61899" WHERE "Opponent(s)" = 'anna-lena grönefeld tatjana malek'