what is the difference between the points juan martin del potro won defending and his new points ?
CREATE TABLE table_204_188 (
    id number,
    "rank" number,
    "player" text,
    "points" number,
    "points defending" number,
    "points won" number,
    "new points" number,
    "withdrew due to" text
)
SELECT ABS("points defending" - "new points") FROM table_204_188 WHERE "player" = 'juan martin del potro'
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: what is the difference between the points juan martin del potro won defending and his new points ? ### Input: CREATE TABLE table_204_188 (
    id number,
    "rank" number,
    "player" text,
    "points" number,
    "points defending" number,
    "points won" number,
    "new points" number,
    "withdrew due to" text
) ### Response: SELECT ABS("points defending" - "new points") FROM table_204_188 WHERE "player" = 'juan martin del potro'