Dodger and Me

Dodger and Me by Jordan Sonnenblick
Willie Ryan is a boy with three problems: he's terrible at baseball and keeps letting his team down, his mother is overprotective, and a girl named Lizzie won't leave him alone. A detour through the woods leads him to a genielike blue chimpanzee called Dodger, who is at first visible only to the fifth grader. Dodger's attempts to solve Willie's problems lead to disaster.