Top seed Vera Zvonareva kicked off her week with a pair of straight set wins in the first two rounds.
Kimiko Date-Krumm also scored a first round win but was stopped in the second round by Hsieh Su-Wei.
Anne Keothavong scored her first career Top 20 win in the first round against Dominika Cibulkova.
Zheng Jie didn't make it out of the first round. The No.5 seed, she lost to qualifier Hsieh Su-Wei.
Maria Kirilenko saved match point in the first round and came from 2-5 third set in the second round.
Veterans Eleni Daniilidou and Tamarine Tanasugarn were among the all-star teams in the doubles.
No.8 seed Vania King didn't lose a set en route to the quarters but that's where her road would end.
No.3 seed Daniela Hantuchova improved to 7-0 lifetime against Vania King with a 76(7) 64 victory.
Sania Mirza became the latest victim of Taiwanese qualifier Hsieh Su-Wei in the quarterfinals, 75 63.
No.7 seed Sorana Cirstea reached the semis when No.1 seed Vera Zvonareva retired due to a hip injury.
Heather Watson, Su-Wei Hsieh and Nicole Rottmann took part in the Sand Reclamation at the beach.
Itthiphol Kunplome, the mayor of Pattaya City, also joined in on the Sand Reclamation activity.
PTT Pattaya Open semifinalist Hsieh Su-Wei took some time to herself during the Sand Reclamation.
Akgul Amanmuradova checked out the eats at a barbecue lunch organized by the tournament on Friday.
In addition to several off-court activities, the PTT Pattaya Open shows incredible player hospitality.