Who became the champion for the 1984 Grand Prix where Marty Davis was the runner-up?
CREATE TABLE table_31076 (
    "Week of" text,
    "Tournament" text,
    "Champion" text,
    "Runner-up" text,
    "Semifinalists" text,
    "Quarterfinalists" text
)
SELECT "Champion" FROM table_31076 WHERE "Runner-up" = 'Marty Davis'
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 became the champion for the 1984 Grand Prix where Marty Davis was the runner-up? ### Input: CREATE TABLE table_31076 (
    "Week of" text,
    "Tournament" text,
    "Champion" text,
    "Runner-up" text,
    "Semifinalists" text,
    "Quarterfinalists" text
) ### Response: SELECT "Champion" FROM table_31076 WHERE "Runner-up" = 'Marty Davis'