Career
He played for the San Antonio Spurs of the National Basketball Association (National Basketball Association). Rains played college basketball for the University of South Alabama from 1977 to 1981. After the close of his college career, Rains was drafted by the San Antonio Spurs of the National Basketball Association in the second round of the 1981 National Basketball Association draft (30th pick overall).
He appeared in 83 games for the Spurs over two seasons, averaging 3.5 points per game.
He was the first player from South Alabama to appear in an National Basketball Association game.