World badminton powerhouse An Se-young has secured her spot in the semifinals of the World Championships for the fourth consecutive time.

In a tight contest, she broke the game open by reeling off nine consecutive points as if possessed.

During the first game of the quarterfinals against world number five Han Yue of China, An looked a bit heavy-legged.

Struggling to seize control, she fell behind 18-17.

This was when the grit of the world's best player truly shone.

After creating an opportunity with tenacious defense, she reclaimed the lead with a powerful smash, ultimately taking the first game and roaring with delight as the stadium erupted.

In the second game, tied at 10-10, she overwhelmingly pressured a fatigued Han with nine unanswered points to seal the victory.

Having advanced to the semifinals with four straight 2-0 victories, An will now face China's Wang Zhiyi for a spot in the final.

(Video by Ha Seong-won)