I prefer this description from Kaptain Karl's 6 playing styles described sticky:
4 a. - Spin Doctor players are the highest developed of the Junk Ballers. They stroke the ball with pace (when they wish) but also with crazy slices, side spins, topspins and some spins we don’t yet have names for. Spin Doctors keep you off-balance, wrong footed and clumsily compensating for their shots by altering your own strokes. They are serious threats to both players who Attack the Net and Baseliners.
Most players would rather have a root canal than play these guys. Their tennis seems as much “psychological warfare” as it is “real tennis” competition. While Spin Doctors’ opponents frequently “lose their cool” during matches, the Doctors themselves tend to be some of the most unflappable players you will encounter.