Sloane Stephens suffered a shock quarter-final exit at the Korea Open on Friday.
The third-seeded American was dismissed 6-3 6-2 in an hour and 17 minutes by world number 136 Aliaksandra Sasnovich, the Belarusian qualifier.
The match between second and fifth seeds Anna Karolina Schmiedlova and Mona Barthel went with the rankings as Schmiedlova prevailed 6-4 3-6 6-1.
Top seed Irina-Camelia Begu brushed aside Sweden's Johanna Larsson 6-4 7-5 and will face Belgium's Alison van Uytvanck in the semi-finals after the eighth seed beat Russian teenager Elizaveta Kulichkova 6-1 4-6 6-2.
Source: PA
