Japan Women’s National Basketball Team Names 13-Player Roster for High-Stakes USA Training Camp

The Japan Basketball Association (JBA) announced on April 14 that a 13-player squad has been selected for an intensive training camp in the United States. Scheduled to run from April 16 through May 1, the camp will see the national team, known as “Akatsuki Japan,” descend upon Arizona and Nevada to test their mettle against some of the most dominant forces in professional basketball.

This expedition is not merely about conditioning. The squad is tasked with bridging the gap between domestic success and the “world-standard intensity” required for the highest levels of international play. The timing is critical, following a grueling qualifying run for the FIBA Women’s Basketball World Cup 2026 in Istanbul, where Japan managed to secure a ticket to Berlin after overcoming a precarious three-game losing streak to start the tournament.

A Youth Movement: The New Face of Akatsuki Japan

The most striking aspect of the 13-player roster is its demographic shift. With an average age of 23.3 and an average height of 175.7 cm, the team is lean, young, and built for mobility. Head coach Corey Gaines is leaning heavily into the next generation of Japanese talent, blending a few seasoned veterans with an influx of emerging stars.

At the opposite ends of the age spectrum are Kadisha Tsuru Umezawa and Miao Shiraishi. Umezawa, the 27-year-old center from the ENEOS Sunflowers, stands as the team’s veteran anchor at 188 cm. On the other end, 19-year-old Miao Shiraishi of the Denso Iris represents the future of the program, entering the camp as the youngest member of the squad.

The roster also features high-profile individual trajectories. Kokoro Tanaka, who has already garnered attention via her draft selection by the WNBA’s Valkyries, is a key inclusion. Mai Yamamoto (26, Toyota Antelopes) joins the squad; Yamamoto has already signaled her intent to participate in “Project B,” a newly established global tournament that will see athletes compete across various international locations next season.

Clash with WNBA Giants: Aces and Mercury

The centerpiece of the Arizona and Nevada tour will be two exhibition games against WNBA powerhouse teams. These matchups are designed to expose the Japanese players to a level of physicality and speed rarely found outside the American professional circuit.

On April 26 (April 27 Japan time), Akatsuki Japan will face the Las Vegas Aces, the reigning WNBA champions. Facing the gold standard of the league provides a direct benchmark for where Japan stands relative to the world’s best.

Following the Aces matchup, the team will grab on the Phoenix Mercury on April 29 (April 30 Japan time). This game carries additional weight for the coaching staff. Head coach Corey Gaines previously spent five seasons leading the Mercury, guiding them to a WNBA championship in 2009. For Gaines, the game is a return to his “former home,” while for the team, it marks the third time Japan has faced the Mercury, following previous encounters in 2012, and 2013.

During a media briefing on April 7, Women’s National Team Director Hiroshi Oguri emphasized the necessity of these matchups, stating that arranging games against world-class teams during the final preparation stages is essential for the team’s overall strengthening.

Full Roster Breakdown

The selected 13 players represent a cross-section of Japan’s top domestic clubs, with the Toyota Boshoku Sunshine Rabbits contributing the highest number of athletes to the squad.

Strategic Implications

By deploying a young roster against WNBA champions, Coach Gaines is opting for “trial by fire.” The goal is to accelerate the development of players like Shiraishi and Tanaka, ensuring they are not overwhelmed by the physicality of the upcoming World Cup in Berlin. The inclusion of versatile forwards and a mix of point guards suggests a tactical focus on speed and perimeter pressure, attempting to negate the height advantage of American opponents.

The camp serves as a critical checkpoint for the JBA to evaluate which of these young players can handle the psychological and physical pressure of elite international competition. With the World Cup on the horizon, the results of the Aces and Mercury games will likely influence final roster decisions and tactical adjustments for the summer.

For more official updates on the team’s progress, fans can follow the Japan Basketball Association.

Next Checkpoint: The team begins its camp on April 16, with the first major exhibition game against the Las Vegas Aces scheduled for April 26.