Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_11900378_1 (tournament VARCHAR, singles_champions VARCHAR)
### Question:
How many singles tournaments did Ludovic Walter win?
### Answer:
SELECT COUNT(tournament) FROM table_11900378_1 WHERE singles_champions = "Ludovic Walter"