Don’t expect him to shout about it. Dominic Thiem seems destined for greatness, thanks to a complete game that combines skill, speed, strength and grace. Yet the eighth-ranked 24-year-old Austrian does seem to be lacking in one area: interest. He may make shots that leave spectators breathless, but his quiet demeanor off the court has kept tennis fans focused elsewhere. Perhaps if he has a chance to beat Rafael Nadal on clay — again — or the reigning superstars age out, people might just start paying attention.