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_23408094_14 ( span_of_years_led INTEGER, tournament_at_which_lead_began VARCHAR )

### Question ###
Of the players whose lead began at the australian championships, what was the shortest span of years led?

### Accurate SQL ###

SELECT MIN(span_of_years_led) FROM table_23408094_14 WHERE tournament_at_which_lead_began = "Australian Championships"