CREATE TABLE table_17238 ("Tournament" TEXT, "Date" TEXT, "City" TEXT, "Country" TEXT, "Surface" TEXT, "Singles champions" TEXT, "Doubles champions" TEXT)

How many singles tournaments did Ludovic Walter win?
SELECT COUNT("Tournament") FROM table_17238 WHERE "Singles champions" = 'Ludovic Walter'
SELECT COUNT("Tournament") FROM "table_17238" WHERE "Singles champions" = 'Ludovic Walter'