Battle Angel Alita, Volume 03: Killing Angel

Her spirit crushed over the loss of Hugo, Alita runs away from Doc Ido and the life she's built in the Scrapyard to become a challenger in motorball, a combat-like game that pits cyborg competitors against each other. As they race through the obstacle course, fighting for the ball, Alita learns her foes will do anything to win, and that losers often don't live to talk about their defeat.