CREATE TABLE table_4448 ("Outcome" CLOB, "Date" FLOAT, "Tournament" CLOB, "Surface" CLOB, "Partner" CLOB, "Opponents in the final" CLOB)

Tell me the opponents for runner-up and surface of grass
SELECT "Opponents in the final" FROM table_4448 WHERE "Outcome" = 'runner-up' AND "Surface" = 'grass'
SELECT "Opponents in the final" FROM "table_4448" WHERE "Outcome" = 'runner-up' AND "Surface" = 'grass'