Tennis: Didn't You Say You Don't Allow the Use of Substitutes in Playing?

Lin Chuan traveled through the Net King world and awakened the substitute messenger system. There's no rule in tennis that you can't have a substitute on the court, right? Is it normal to start with Platinum Star Euler and Atobe Keigo to win the title of head of the Hyotei Tennis Club? National competition? U17? The unparalleled Nanjiro in ancient and modern times? Lin Chuan, who holds Platinum Star, The World, Crazy Diamond, Crimson King, and Made in Heaven, can easily defeat him. How powerful is Byodoin Phoenix's light ball attack? Eat me and smash Varudo! No matter how powerful the ball is, it is of no use as long as time stops! Is it impossible to prevent Xincun Jingshi from destroying his five senses? Look at my Crimson King predicting future time deletion! Echizen Ryoma's Wugo copying skills? Have you never seen the horror of spicy sauce in the cafeteria and the growth of Platinum Star? Eat my Ola Ola! Even if the different dimensions and the supreme realm are all incompetent! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.