(plural back walls)
back + wall, because it is a wall and is located at the back of the court.
"back-wall." YourDictionary, n.d. Web. 11 October 2018. <http://www.yourdictionary.com/back-wall>.
back-wall. (n.d.). Retrieved October 11th, 2018, from http://www.yourdictionary.com/back-wall
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