text: 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"