Abstract: The invention comprises a ball retrieval arm mechanism extending from the base line to the tennis net on a tennis court and can be moved along the net. During the retrieving process, the retrieving arm moves only one time during each passage in a transverse direction over one half of the tennis court. The retrieving arm continues its movement until it reaches one side edge of the tennis court. Ball receiving channels are provided along both sides of the tennis court, into one of which the balls are thrust by the retrieving arms and transported by conveyor belts to one top end of the tennis court. The ball receiving channels have connections to a conveyor chute by which the balls are transported from the corners of the tennis court to a ball retriever placed in the middle of the top of the tennis court or to a ball retriever directly. The retrieving arm is preferably guided only at one end thereof by a guide rail extending along the top of the tennis court.