Who were the opponents in the match that was played on a hard court and had a runner-up outcome?
CREATE TABLE table_name_84 (
    opponents VARCHAR,
    surface VARCHAR,
    outcome VARCHAR
)
SELECT opponents FROM table_name_84 WHERE surface = "hard" AND outcome = "runner-up"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Who were the opponents in the match that was played on a hard court and had a runner-up outcome? ### Input: CREATE TABLE table_name_84 (
    opponents VARCHAR,
    surface VARCHAR,
    outcome VARCHAR
) ### Response: SELECT opponents FROM table_name_84 WHERE surface = "hard" AND outcome = "runner-up"