The 2019-20 season marked Mooney's rookie season. He appeared in four games with the Cavaliers. His debut occurred Jan. 20 against the Knicks. Mooney played three minutes and posted two points, one rebound, one assist and one block. He saw most of his minutes Mar. 10 against the Bulls. Mooney played 16 minutes and recorded two rebounds and one steal. Overall, he totaled two points, three rebounds, two steals, one assist and one block in 19 minutes.
January 15, 2020Signed a two-way contract with the Cavaliers.