Jackknife
Desperate to win, Momoshiro inadvertently performs a high level technique called the "Jack Knife" during the match. With it, Momoshiro is able to take the lead, and eventually wins the match with sheer will when he realizes he has a cramped foot. Before his match with Akutsu, Ryoma is warned by his friends about his dangerous opponent, however, Ryoma ends up as the aggressive one when he starts the match out with smashing the ball directly toward Akutsu's face.
Aired 14/08/2002EP 44 - Jackknife
The Prince of Tennis
Echizen Ryoma is a young tennis prodigy who has won 4 consecutive tennis championships but who constantly lies in the shadow of his father, a former pro tennis player. He joins the Seishun Gakuen junior highschool, one of the best tennis schools in Japan, and there along with his teamates he learns to find his own type of tennis in an attempt to defeat his biggest obstacle of all: his father as well as himself.
(Source: Anime News Network)