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_21584646_10 ( week_of VARCHAR, champion VARCHAR )

### Question ###
How many weeks are shown for the champion of john mcenroe 6 2, 6 3?

### Accurate SQL ###

SELECT COUNT(week_of) FROM table_21584646_10 WHERE champion = "John McEnroe 6–2, 6–3"