Marmalade Boy: Collector's Edition 2 by Wataru Yoshizumi

GAME, SET, MATCH! Ginta and Yuu are in the middle of their tennis match, but it’s not going so well for them. Ginta is totally off his game, but it has nothing to do with the bet he placed, and everything to do with the fact that Miki said she hates him. Can he get his act together in time for them to win the match? Or are Miki’s suitors doomed to lose—the game and their hair?