In a medium size mixing bowl, combine brown sugar, Worcestershire sauce and ketchup. Cut bacon in half. Wrap one slice of bacon around each chestnut. Secure the bacon with a toothpick. Arrange the water chestnut wraps in a 9 x 13 inch baking dish.
Bake the water chestnut wraps for 10 to 15 minutes. Remove the water chestnut wraps from the oven and drain some of the grease out of the pan. pour the sauce over the wraps.
Bake for 30 to 35 more minutes.