
The Thai qualifier ranked 168th in the world appeared to be surrendering easily in the final set, trailing the world No 6 5-2. But she rallied back with her double-fisted groundstrokes to level at five-all then had several break points.
Experience told, however, as the Grand Slam winner held and then broke serve easily in the next game to close out the match 6-3 3-6 7-5.
Thai No 1 and defending champion Tamarine Tanasugarn meets Frenchwoman Mathilde Johansson in the second round today.