The boy with big dreams has, step by step, season by season, become the man capable of striding into the semi-finals of the US Open without dropping a set.
Jack Draper - an "absolute tennis keeno", in the words of former British number one Laura Robson - was not blessed with height as a boy.
But a timely growth spurt in his late teens took him to 6ft 4in and, now his body has got used to the idea, the 22-year-old is starting to look highly dangerous.
Capable of making short work of service games and dominating from the baseline, Draper has also been thinking carefully about two things central to many of our daily lives: smart phones and caffeine.