The Japanese Gyroball Mystery - The New York Times
Mysterious ball appears on Japanese beach - CBS News
Mets Rookie Uses All the Angles to Disguise Pitches - The New York Times
E-Ticket: Chasing the Demon Sphere
Is Japanese hurler Yoshinobu Yamamoto worth $200M to the Mets?
Yankees' Masahiro Tanaka Epitomizes the Japanese Approach to Baseball - The New York Times
Not Much to Matsuzaka's Mystery Pitch - The New York Times
The 10 Best Pitchers from Japan in MLB History, News, Scores, Highlights, Stats, and Rumors
The Riddle - Sports Illustrated Vault
Tom Caron: In Boston 17 years ago, the hype was about a different Japanese pitcher
The 10 Best Pitchers from Japan in MLB History, News, Scores, Highlights, Stats, and Rumors
E-Ticket: Chasing the Demon Sphere
Shuuto - Wikipedia
How to Throw a Gyroball: 15 Steps (with Pictures) - wikiHow
Yankees' Masahiro Tanaka Epitomizes the Japanese Approach to Baseball - The New York Times
An Analysis of the Gyroball – Society for American Baseball Research