Overview

• Cygames issued an official statement on August 8 confirming Grass Wonder’s death from multiple organ failure linked to age-related decline, while Big Red Farm shared condolences via Instagram.
• The Umamusume: Pretty Derby team paid tribute on its official X account, honoring its virtual character inspired by the champion racehorse.
• Grass Wonder broke onto the late 1990s scene with an undefeated debut, a record-setting win in the Asahi Hai Futurity Stakes and three straight Grand Prix titles.
• Over a 15-race career, he recorded nine victories and earned more than ¥690 million in prize money, cementing his status in Japanese racing history.
• In retirement he excelled as a stallion, siring multiple Grade 1 winners including Screen Hero, whose progeny feature champion stallion Maurice.