Ryusei Sakai books Wonder Dean for 2026 Kentucky Derby ride

Ryusei Sakai’s 2026 Kentucky Derby path tightened when he was named to ride Wonder Dean, the UAE Derby winner who already owns 106 qualifying points and a growing international profile. Sakai, best known globally for his partnership with Forever Young, is not just getting one Derby mount either. He also secured two additional rides, a sign that his presence at Churchill Downs is becoming more than symbolic.

Wonder Dean arrives with the kind of résumé that makes the assignment matter. The dark bay colt was born in Japan on March 25, 2023, is trained by Daisuke Takayanagi for owner Yoshinari Yamamoto, and has already raced in three countries while banking more than $770,000. His 100 points from the UAE Derby put him atop the Euro/Mideast Road leaderboard, and his total rose to 106 after adding 6 points from a fourth-place finish in the Saudi Derby. The UAE Derby top two, Wonder Dean and Six Speed, both indicated they intend to run in the Kentucky Derby, which keeps the transatlantic path into Louisville firmly alive.

That is why Sakai’s booking reads like a larger industry signal. Japan’s Derby campaign is no longer a one-horse storyline built around a single star. It is a coordinated push with recognizable riders, proven travel, and horses that have already handled pressure on dirt in Dubai and Saudi Arabia. Sakai’s name carries extra weight because of his work with Forever Young, and Wonder Dean gives that connection another major stage in the American classics.

The Japanese footprint at Churchill Downs has been expanding for several years. After Forever Young’s near-miss, a record 69 Japanese horses were nominated to the 2025 Triple Crown. From 2022 through 2025, seven Japan-based horses competed in the Kentucky Derby, with at least one every year. That streak gives Sakai’s assignment more significance than a single ride sheet. It is part of an established pattern that has turned Derby week into a cross-Pacific showdown.

Sakai and trainer Yoshito Yahagi already tested the Churchill Downs routine in 2023 with Continuar, though that colt scratched two days before the race. They stayed on to observe Derby week, a trip that helped shape future plans. Now Sakai returns with Wonder Dean, a Japan-trained colt with international form, a proven qualifying route, and a place in a Derby picture that is looking increasingly Japanese by design.