Who was his partner in 1989?
CREATE TABLE table_73939 (
    "Year" real,
    "Championship" text,
    "Surface" text,
    "Partner" text,
    "Opponents in final" text,
    "Score in final" text
)
SELECT "Partner" FROM table_73939 WHERE "Year" = '1989'
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 was his partner in 1989? ### Input: CREATE TABLE table_73939 (
    "Year" real,
    "Championship" text,
    "Surface" text,
    "Partner" text,
    "Opponents in final" text,
    "Score in final" text
) ### Response: SELECT "Partner" FROM table_73939 WHERE "Year" = '1989'