Below is an instruction that describes a task. Write a response that appropriately completes the request.

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

### Inputs:
table_name: table, columns: ['Years led', 'Span of years led', 'Player', 'Titles won at point of lead', 'Total Career titles', 'Tournament at which lead began']

### Response:
SELECT MIN Span of years led FROM table WHERE Tournament at which lead began = Australian Championships