Akane Yamaguchi continued her march toward a second straight women's singles badminton world championship with a 21-19, 21-12 victory over South Korea's An Se Young in Saturday's semifinals.

The world No. 1 will battle Tokyo Olympic gold medalist Chen Yufei of China in the final on Sunday, the last day of the BWF World Championship at Tokyo Metropolitan Gymnasium.

Yamaguchi outlasted third-seeded An in a tough first game, clinching it with two consecutive points after the scores were deadlocked 19-19.