Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_91 (tournament VARCHAR)

### Question ###
What is the 2006 when the 2013 is 2r, and a Tournament was the us open?

### Accurate SQL ###

SELECT 2006 FROM table_name_91 WHERE 2013 = "2r" AND tournament = "us open"