Mo’ne Davis calls for the ball. She drains a three, holding her follow-through for a second longer as she and a teammate battle two others for most threes made during a drill. “BOOM!” the boys on the sideline shout. Davis, wearing white and chrome Nike Kobe A.D.s, scurries around the perimeter, releasing shot after shot. “They cheatin’!” Davis hollers, waving her arms and hip-checking one of her opponents. She pops three more in a row. “Oh yeaaaaahhhh,” she says, bouncing up and down, sensing victory. Davis has been knocking down shots at Philadelphia’s Marian Anderson Recreation Center with these same boys—her teammates on the Anderson Monarchs, a youth recreational team—for the past eight years. The center’s gym, with its four rows of brown bleachers, its cream-colored wall tile and its green and white scoreboard, has long been home to the 15-year-old.