Singapore's Feng Tianwei produced a sensational performance to beat world number one and top seed Chen Meng in straight games at the International Table Tennis Federation (ITTF) German Open in Bremen.
The ninth seed secured her place in the quarter-finals in just over 30 minutes, defeating her illustrious Chinese opponent at ÖVB Arena 11-6, 11-2, 11-4, 11-8.
Chen had been looking to equal the record for ITTF World Tour titles in a calendar year.
The 25-year-old has four triumphs so far this season, and would have equalled the five claimed by legendary compatriot Zhang Yining, who achieved the feat in 2003, if she had won in Bremen.
But her hopes were shattered by a stunning display from Feng, who will go on to face home favourite Shan Xiaona in the last eight.
Shan followed up yesterday's win against eighth seed Doo Hoi Kem of Hong Kong by defeating 14th-seeded Japanese Hitomi Sato 11-9, 11-7, 11-7, 12-10.
Second-ranked Wang Manyu of China is now the highest-seeded player left in the women's singles draw after she overcame South Korea’s Jeon Jihee 11-3, 11-6, 9-11, 11-7, 11-7
Next up for her is compatriot Wang Yidi, who beat Zhang Rui 11-9, 11-6, 11-8, 11-7.
Third-seeded Chinese Sun Yingsha and fourth-seeded Japanese Mima Ito are also through to the quarter-finals.
Sun defeated Russia’s Olga Vorobeva 11-7, 11-6, 11-2, 11-4 and meets fellow Chinese Chen Xingtong, a 9-11, 11-7, 11-8, 11-8, 11-8 winner over Japan's Miyu Kato.
Ito overcame China’s Qian Tianyi 11-6, 11-7, 9-11, 11-8, 10-12, 11-7 to set up a clash with Monaco's Yang Xiaoxin, who was a surprise 7-11, 11-8, 11-9, 14-12, 15-13 victor at the expense of fifth-seeded Japanese Kasumi Ishikawa.
In the round of 16 in the men's singles event, top seed Xu Xin of China beat South Korea’s Lee Sangsu 11-7, 9-11, 11-7, 11-3, 10-12, 11-9
Standing between him and a place in the semi-finals is compatriot Yan An, who defeated fifth-seeded Brazilian Hugo Calderano 8-11, 11-9, 8-11, 7-11, 13-11, 11-7, 11-8.
Second-seeded Chinese Fan Zhendong is also through to the last eight after overcoming fellow Chinese Wang Chuqin 9-11, 11-4, 11-6, 13-11, 11-13, 14-12.
Next up for him is sixth-seeded home favourite Timo Boll, who claimed an 8-11, 11-9, 11-6, 11-4, 7-11, 9-11, 12-10 win over Japan’s Jun Mizutani.
There was a shock elimination for third-seeded Chinese Lin Gaoyuan following a 5-11, 6-11, 11-9, 7-11, 9-11 loss to Germany's Patrick Franziska.
The home player's reward is an encounter with South Korea’s Jeoung Youngsik, an 11-6, 7-11, 11-8, 9-11, 9-11, 11-9, 11-8 victor at the expense of ninth-seeded Japanese Koki Niwa.
The other quarter-final tie pits fourth-seeded Japanese Tomokazu Harimoto against seventh-seeded Chinese Liang Jingkun.
Harimoto beat Belarus' Vladimir Samsonov 11-2, 11-7, 11-5, 9-11, 11-6, while Liang defeated compatriot Yu Ziyang 11-5, 12-10, 4-11, 11-5, 11-4.
Action in Bremen is due to continue tomorrow.