Published by Street & Smith from February 11, 1905 to March 3, 1906. Format: nickel weekly.
Publisher's description: "All of you, boys, are interested in clean sport, and the stories published in the library are just what you have been looking for. Jack Lightfoot and his comrades indulge in up-to-date games, and while they make every effort to win fairly, the disdain to employ mean or petty methods. They have enemies, too, who make things extremely interesting for them and also for our readers. These are the best tales of athletic sports. No boys should miss them."