The two leads, Christian Alexander Cruz and Kieran Tamondong, worked together previously on NARUTO: KAKASHI VS. OBITO FIGHT (RE:ANIME).
The story is based on two brothers who were the director's practice partners as a competitive junior tennis player.
The majority of tennis match play in the film employs a computer generated tennis ball. To time the actors' swings and movements, the director created custom-spliced audio tracks with Djokovic and Nadal's grunts, which were blasted with a boom box so that the actors could "grunt along".