Watermelon Spritzer

4 cups watermelon juice*
12-ounce can frozen cranberry juice concentrate
6 ounces frozen limeade concentrate
3 cups club soda, chilled

In a blender, combine watermelon juice, cranberry concentrate and limeade concentrate; chill after mixing. Just before serving, stir in club soda.
*For watermelon juice, process chunks of seeded watermelon until liquefied.