Marie Bouzkova is through to the quarter-finals at the Abierto Zapopan in Guadalajara after beating Lucia Bronzetti in straight sets.
The Czech, ranked 96th in the world, will play either number three seed Sara Sorribes Tormo or Magdalena Frech in the last eight after sealing a 7-6 (7-2) 6-2 win against Bronzetti.
Anna Kalinskaya is also through after following up her impressive first-round win against eighth seed Qinwen Zheng by beating another Chinese opponent, Xinyu Wang 6-4 0-6 6-4.
The Russian had a mixed outing and looked to be on the ropes after losing the second set, but recovered and will go up against either fourth seed Camila Osorio or Hailey Baptiste in the quarter-finals.
One last eight match that has been finalised will be between Qiang Wang and Anna Karolina Schmiedlova after they beat Harmony Tan and Anastasia Potapova respectively.
Wang overcame her French opponent – who had eliminated second seed Madison Keys – 6-4 6-2, while Schmiedlova also won in straight sets against Potapova, 6-3 7-6 (7-5).