Sportsman Hunt is an event in the New Prince of Tennis. It started in Golden Age 023: Sports Man Hunt (Opening Act) and concluded in Golden Age 024: Sports Man Hunt (Final Act). In the anime, it was episode 9, Evolution and Change.
Presumably this occurs every year for the losers sent to mountain training. Unknowingly to the participates, Sportsman Hunt is a good way for the participants to improve on skills they are lacking. Losers of the Hunt would have to wash every stain off the coach's loincloths.
In the end, the current year's hunt was interrupted when Kintaro and Ryoma had an argument and settled it with a chestnut match.
All the losers of the Tiebreaker-style Elimination Match.