Maria Kirilenko has advanced to the second round of the Pattaya Open after overcoming Akgul Amanmuradova 6-3 7-5 on Tuesday, while there were contrasting fortunes for the Australians.
The Russian needed just under two hours to beat the Uzbek qualifier in what was a closer than expected encounter, with Amanmuradova taking the match to the world number 15 in the second set after being brushed aside in the first.
Second seed Kirilenko will now face local wildcard Luksika Kumkhum after she surprised Australian Open women's doubles finalist Casey Dellacqua 6-2 6-2.
Meanwhile, Romanian fourth seed Sorana Cirstea was barely tested as she breezed into the next round with a crushing 6-1 6-3 victory over American qualifier Bethanie Mattek-Sands.
The victory sees the world number 30 set up a clash with Australian Anastasia Rodionova after she overcame Vania King of America 6-4 6-4.
In an all-German battle, fifth seed Sabine Lisicki was far too good for compatriot Tatjana Malek in her 6-2 6-3 win.
In a match that lasted exactly an hour, Lisicki managed to hit five aces and convert 80 percent of her break-point opportunities to advance with relative ease.
Fresh from her third-round exit at the Australian Open, British eighth seed Heather Watson cruised through her opening-round match with Timea Babos after the Hungarian retired hurt in the second set with Watson leading 6-1 3-0.
Latvia's Anastasija Sevastova will be Watson's next opponent after she was victorious over Japan's Misaki Doi 6-4 6-2.
The news was better for Doi's compatriot Kimiko Date-Krumm, with the 42-year-old veteran beating Chanelle Scheepers 7-5 6-1 while Russia's Nina Bratchikova was also successful, beating Israel's Shahar Peer 6-3 6-3.
Number one seed Ana Ivanovic will have to return to the court on Wednesday to complete her match with Ayumi Morita after rain forced an early end to play.
The Serbian won the first set 6-3 before being pegged back by Morita in second as the world number 60 took it 7-5.
The 22-year-old from Japan is 2-1 up in the third set leaving Ivanovic with work to do if she is to avoid a shock first-round exit.
The match between seventh seed Elena Vesnina and Greece's Eleni Daniilidou was also affected by rain with the Russian leading 6-2 1-0 when the weather forced a halt to proceedings.
Meanwhile, Julia Goerges has crashed out in the opening round of the Open GDF Suez in Paris after losing 7-5 5-7 7-6 (7-4) to local wildcard Kristina Mladenovic.
The German seventh seed, who is 68 places above Mladenovic in the world rankings, could not outlast the Frenchwoman who delighted the home crowd with her epic win which took more than two and a half hours.
In other matches, Italian Roberta Vinci cruised into the second round after crushing Simona Halep 6-0 6-3 on Tuesday.
The fifth seed, who managed to record seven aces, needed just 52 minutes to complete the win and will now face Germany's Mona Barthel who won through to the second round on Tuesday.
Swiss qualifier Stefanie Voegele proved to be too much for Tsvetana Pironkova to handle as she won 6-4 6-2 to progress the next round.
She will be joined by Spain's Carla Suarez Navarro after she beat Monica Niculescu 6-3 7-6 (7-3), along with local hopeful Alize Cornet who overcame Swede Sofia Arvidsson 6-3 4-6 6-0.