Madison Keys knocked off fourth-seeded Anastasia Kharchenko, and Gabriela Paz beat Sabrina Santamarina in the other quarterfinal matches.
Fifth-seeded Yuliana Lizarazo beat Nicola Slater, 7-5, 6-3, on Friday in the Ladies Cleveland Open at the Chagrin Valley Athletic Club in Chagrin Falls to advance to today's semifinals.
Lizarazo will play No. 3 seed Piia Suomalainen in the first semifinal at 10 a.m. Suomalainen topped Caitlin Whoriskey, 6-3, 7-6(5).
Madison Keys knocked off fourth-seeded Anastasia Kharchenko, and Gabriela Paz beat Sabrina Santamarina in the other quarterfinal matches. The Keys-Paz semifinal follows the first, but will not start before 1 p.m.