What is the 1991 when 1990 is ATP Masters Series?
CREATE TABLE table_name_53 (Id VARCHAR)
SELECT 1991 FROM table_name_53 WHERE 1990 = "atp masters series"
### 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"