Twelve months ago, Hsieh won her second career title with a rollercoaster victory over Laura Robson at the Tianhe Sports Center, but her first round with Ormaechea was devoid of any such drama.
After an early exchange of breaks, No.6 seed Hsieh began to befuddle her Argentine opponent as her smorgasbord of shots helped her to a 61 62 win in just 56 minutes. Next up for Hsieh will be Chinese wildcard Zhang Shuai, who defeated Olga Puchkova, 60 76(1).
No.8 seed Monica Puig was given a sterner workout, coming from a break down in both sets before seeing off the stubborn resistance of qualifier Nadiya Kichenok, 75 76(4).
This was the 37th win of what has been a breakthrough year for Puig on tour. Having started out in January well outside the Top 100, the Florida-based Puerto Rican arrived in China safely inside the Top 50.
Meeting her for a place in the quarterfinals will be Galina Voskoboeva after she brushed aside Petra Cetkovska, 63 61. Other opening round winners included Vania King, Karolina Pliskova and Johanna Konta.