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_1547951_3 ( year VARCHAR, outcome VARCHAR, championship VARCHAR )

### Question ###
Name the total number of years where runner-up and championship is us open

### Accurate SQL ###

SELECT COUNT(year) FROM table_1547951_3 WHERE outcome = "Runner-up" AND championship = "US Open"