Players of Serbia celebrate during a round robin match against Japan at the 2019 FIVB Volleyball Women's World Cup in Osaka, Japan, Sept. 27, 2019. (Xinhua/Du Xiaoyi)

Yuki Ishii (Top, L) of Japan spikes the ball during a round robin match against Serbia at the 2019 FIVB Volleyball Women's World Cup in Osaka, Japan, Sept. 27, 2019. (Xinhua/Du Xiaoyi)

Players of Serbia celebrate during a round robin match against Japan at the 2019 FIVB Volleyball Women's World Cup in Osaka, Japan, Sept. 27, 2019. (Xinhua/Du Xiaoyi)

Kumi Nakada (C), head coach of Japan, gives instructions during a round robin match against Serbia at the 2019 FIVB Volleyball Women's World Cup in Osaka, Japan, Sept. 27, 2019. (Xinhua/Du Xiaoyi)

Aika Akutagawa (R) of Japan spikes the ball during a round robin match against Serbia at the 2019 FIVB Volleyball Women's World Cup in Osaka, Japan, Sept. 27, 2019. (Xinhua/Du Xiaoyi)

Players of Japan celebrate during a round robin match against Serbia at the 2019 FIVB Volleyball Women's World Cup in Osaka, Japan, Sept. 27, 2019. (Xinhua/Du Xiaoyi)

Maja Aleksic (L) of Serbia competes during a round robin match against Japan at the 2019 FIVB Volleyball Women's World Cup in Osaka, Japan, Sept. 27, 2019. (Xinhua/Du Xiaoyi)

Players of Japan celebrate during a round robin match against Serbia at the 2019 FIVB Volleyball Women's World Cup in Osaka, Japan, Sept. 27, 2019. (Xinhua/Du Xiaoyi)

Ai Kurogo (R) of Japan spikes the ball during a round robin match against Serbia at the 2019 FIVB Volleyball Women's World Cup in Osaka, Japan, Sept. 27, 2019. (Xinhua/Du Xiaoyi)

Risa Shinnabe of Japan serves during a round robin match against Serbia at the 2019 FIVB Volleyball Women's World Cup in Osaka, Japan, Sept. 27, 2019. (Xinhua/Du Xiaoyi)

Teodora Pusic (2nd L) and Mina Popovic (1st R) of Serbia help their teammate Sladjana Mirkovic (2nd R) to stand up during a round robin match against Japan at the 2019 FIVB Volleyball Women's World Cup in Osaka, Japan, Sept. 27, 2019. (Xinhua/Du Xiaoyi)