Third-seeded Ekaterina Alexandrova of Russia beat seventh-seeded Yue Yuan of China 7-5, 7-6 (3) on Thursday night to reach the Monterrey Open semifinals. Alexandrova will face Lulu Sun of New Zealand, a 6-4, 6-3 winner over Erika Andreeva of Russia in the WTA 500 event at Sonoma Club. The 29-year-old Alexandrova won the last of her four career WTA Tour titles last year at Hertogenbosch in the Netherlands.