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

### Instruction:
How many singles tournaments did Ludovic Walter win?

### Inputs:
table_name: table, columns: ['Tournament', 'Date', 'City', 'Country', 'Surface', 'Singles champions', 'Doubles champions']

### Response:
SELECT COUNT Tournament FROM table WHERE Singles champions = Ludovic Walter