Ryūji Tsuge (柘植竜二, Tsuge Ryūji) is the devil coach who is responsible for the harsh training in the camp. All the camp's practice menu were prepared by Tsuge. 
Tsuge is U-17 Camp's Circuit Coach. He also seems to be the adviser for the dorms. He's in charge of training their physicality. He won't go easy on assigning them strict training. Standing together with the players on the court, he's the coach who directs their training.
- Hobby: Crawling Onwards!
- Favorite color: Red
- Favorite food: Hamburger and Cola (instant calories)
- Most wanted thing at the moment: Dumbbell
- Thing/s that he is bad at/dislikes: PC
- Specialty other than tennis: Weekend carpenter