Abstract: An automatic table tennis ball serving device is disclosed as having a generally vertically extending enclosure with a table tennis ball feeding passageway including a lower ball entrance and an upper ball dispensing outlet. Ball feeding arms are mounted to the enclosure adjacent the lower ball entrance for feeding table tennis balls upwardly in the ball feeding passageway against the force of gravity. A ball dispensing head is mounted to the enclosure adjacent the upper ball dispensing outlet for serving table tennis balls to a player at selected rates and trajectories. The ball dispensing head includes a ball size adjustment mechanism to enable table tennis balls of at least two diameters to selectively pass through the ball dispensing head when one or another diameter of the at least two different ball diameters is selected by the player.