Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_53 (Id VARCHAR)
### Question:
What is the 1991 when 1990 is ATP Masters Series?
### Answer:
SELECT 1991 FROM table_name_53 WHERE 1990 = "atp masters series"