A fastball that cracks 165 m.p.h. A devoted student of "yogic mastery." A name like "Hayden Siddhartha Finch." A baseball player like that has to be too good to be true and he was. Sidd (for short) was merely the figment of Sports Illustrated writer George Plimpton's imagination. That was enough to get him a 1985 article in the magazine. Mets coach Mel Stottlemyre got in on the ruse, posing for a photo talking to "Sidd," who was actually an art teacher masquerading as the fake baseball player.