Walter R. Brooks 
Freddy and the Baseball Team from Mars [EPUB ebook] 

Mr. Boorschmidt’s circus in Centerboro boasted a new attraction—six real Martians, in their original flying saucer, the first six Martians ever to be exhibited anywhere. But Mr. Boorschmidt felt the customers were not getting their money’s worth. Freddy decided to help by organizing a Martian baseball team. Anyone who can imagine a baseball team consisting of Martians, an elephant, an ostrich, and Mr. Boorschmidt, with Freddy as coach, has a slight idea of what’s in store.