THE JAPANESE IN NEW-YORK.; Effect of the Grand Ball- More Visits to the Stores--Excursions To-day--The Approaching Departure. - The New York Times
How to Throw a Gyroball: 15 Steps (with Pictures) - wikiHow
E-Ticket: Chasing the Demon Sphere
E-Ticket: Chasing the Demon Sphere
Japan's Kodai Senga Brings Ghost Fork Pitch to Mets - The New York Times
Tom Caron: In Boston 17 years ago, the hype was about a different Japanese pitcher
Yankees' Masahiro Tanaka Epitomizes the Japanese Approach to Baseball - The New York Times
New Mets pitcher has devastating 'ghost' pitch
An Analysis of the Gyroball – Society for American Baseball Research
Different Types of Sliders : r/baseball
E-Ticket: Chasing the Demon Sphere