Bangkok: Unseeded Nicole Pratt of Australia staged a stunning first round upset of second-seeded Maria Kirilenko, defeating her Russian opponent 7-6 (1), 2-6, 7-5 on the second day of play at the US$170,000 (aÂÂ¬131,500) Pattaya Women's Open.The 33-year-old Australian demonstrated fine stamina by winning the 2-1/2 hour match, which was interrupted for almost two hours by unseasonal rain."It was a good effort. I played well the whole match. I lost concentration in the second set and came back from a breakdown in the third set. I just waited for my shots and kept fighting, said Pratt.Sybille Bammer of Austria produced the other upset of the day by beating seventh-seeded Russian Vasilisa Bardina 6-1, 6-4.Other contentionsJapan's eighth-seeded Aiko Nakamura shrugged off a slow start to down Thai qualifier Noppawan Lertcheewakarn 3-6, 6-3, 6-1. Sixth-seeded Gisela Dulko of Argentina also advanced after routing Sun Tian-tian of China 6-4, 6-1.Alla Kudryavtseva of Russia also came back from a set down to beat Meng Yuan of China 1-6, 6-1, 6-3.In other first round play, Israeli Tzipora Obziler beat Yuliana Fedak of Ukraine 6-2, 6-2, and Romina Oprandi of Italy beat Olga Savchuk of Ukraine 3-6, 6-4, 7-5.In late matches, Vania King of the United States beat Croatia's Jelena Kostanic Tosic 6-1, 6-3, and Martina Sucha of Slovakia defeated Slovenia's Andreja Klepac, 7-5, 6-3.