Get a Grip, Vivy Cohen by Sarah Kapit
Vivian J Cohen is a typical eleven-year-old. She likes cheese sandwiches and pizza. She likes baseball. Vivy enjoys watching televised professional games with her dad. Her favorite player is VJ Capello.
In some respects she may be a not-so-typical fifth grader. She is a baseball (NOT softball) pitcher and can throw a mean knuckleball. She dreams of becoming the first female to play professionally. She is autistic, prone to meltdowns and flapping her hands when she gets anxious or excited.
When she was eight years old, she met minor league pitcher VJ. He took her aside and taught her how to throw a knuckleball. She has never forgotten him. Three years later Vivy has a letter-writing assignment. She opts to write to VJ. They begin a lively correspondence, mainly via email.
Kapit begins the epistolary novel on the first day of spring training and concludes with the league's final game for the season. Their emails include plenty of play by play baseball action.