Top seed Caroline Wozniacki raced through the opening round of the Malaysian Open, but Sabine Lisicki and Casey Dellacqua were surprise casualties on Tuesday.
World number five Wozniacki needed just 69 minutes to power her way past qualifier Wang Yafan in a 6-3 6-1 victory in Kuala Lumpur.
The Dane, who suffered a surprise first-round exit in her only other appearance at the tournament in 2013, broke her opponent's serve on five occasions in a dominant display and goes on to meet Zhu Lin in round two.
However, second seed Sabine Lisicki fell at the first hurdle in a 6-4 7-5 defeat to Alexandra Dulgheru.
The German is ranked some 66 places ahead of Dulgheru in the WTA rankings, but lost the first set after her opponent fmade a crucial breakthrough in the seventh game.
There were nine breaks of serve in an error-strewn second set and once again it was Dulgheru who held her nerve at the crucial moment to progress to round two.
Australia's Casey Dellacqua, seeded third, made a better fist of it against 2012 champion Hsieh Su-wei, but it was the wildcard who defeated her more illustrious opponent in a a 7-5 2-6 6-3 win.
There were so such problems for fourth seed Jarmila Gajdosova and eighth seed Julia Goerges, who achieved straight-sets victories over Cagla Buyukakcay and Alla Kudryavtseva respectively.
Fifth seed Klara Koukalova also went through after snapping a four-match winless run to beat Patricia Mayr-Achleitner 6-1 6-3.
There were also first-round successes for Carina Witthoeft and Misa Eguchi.