The Chinese Saisai Zheng, third seed, maintained the solidity of her game to defeat her compatriot Lin Zhu 6-1, 6-2 on Thursday and access the quarterfinals of the Monterrey Tennis Open.
Zheng, number 52 on the WTA list, frightened her compatriot with early breaks, made few mistakes and carried both sleeves comfortably.
Key for Sai Zheng was his equanimity in times of risk, which allowed her to emerge unscathed from the five chances her opponent had to crack her serve.
In the top eight phase, Zheng will face Asian American Ann Li, who eliminated Slovenian Tamara Zidansek 6-4, 6-3.
Li distributed her five breaks well and with good winning shots she surpassed the European.
In another game, Russia's Anna Kalinskaya, the world's 72nd racket, beat Serbian Nina Stojanovic 6-4, 6-3.
Kalinskaya showed a performance of 67.2 percent on his first serve and with a decisive break in the tenth game he took the first set.
In the second he imposed conditions with good winning shots and a break in the eighth to sign the pass to the phase of the best eight in which She will face the Swiss Victorija Golubic, who eliminated American Lauren Davis 6-3, 6-1.
This Friday the Spanish Sara Sorribes, seventh seeded, who last week won her first professional title at the tournament in Zapopan, Guadalajara, will play with Slovak Anna Karolina Schmiedlova, 111 of the world ranking.
In the other duel the Canadian Leylah Fernández, one of the most promising figures on the WT circuit, will face the Slovakian Viktoria Kuznova.
The Monterrey Tennis Open, a WTA 250 tournament, is played on a hard court with a prize pool of 235,238 pesos.