NUMBER two seed Olivia Rogowska became the first big name casualty as the William Loud Bendigo International heated up on Wednesday.
Last year's runner-up, Rogowska was punted in three sets by Viktorija Rajicic in their opening round clash.
Rajicic served-out a thrilling match to win 6-3 6-7 6-4 at the Bendigo Tennis Association's Nolan Street courts.
In an all-Melbourne battle, Rajicic came to grips with the blustery conditions best to claw her way to the second round.
It was a big upset by the 19-year-old, who is ranked 126 places in the world lower than no. 166 Rogowska.
Rajicic has now set up a second round match-up against Belarus' Ysaline Bonaventure.
Bonaventure cast aside Tammi Patterson 6-3 6-4 in their first round encounter on Wednesday.
While Rogowska was bounced from the first of two $50,000 Bendigo Internationals in the coming fortnight, the other seeds sailed relatively smoothly into the second round.
Perth star and fourth seed Casey Dellacqua clicked into gear when it counted to oust Czech Republic's Petra Krejsova 6-4 6-3.
And American top seed Irina Falconi breezed past 15-year-old wilcard Pamela Boyanov 6-1 6-0.
Falconi looms as a big challenge for Monique Adamczak, who served out the match in her 6-4 6-2 over Alison Bai on court six.
French eighth seed Irena Pavlovic held-off an improving Ayaka Okuno from Japan 6-1 7-6.
Fifth seed Sachie Ishizu fared better than her countrywoman.
The Japanese star bounced back from losing the first set to knockout plucky Kiwi qualifier Emma Hayman 5-7 7-5 6-0.
Ishizu will face Sally Peers in the second round after the Melbourne ace triumphed 6-4 6-3 over wildcard Ashley Keir.
Defending champion Arina Rodionova wasted no time in disposing of New Zealander Dianne Hollands.
The sixth seed romped to a 6-2 6-4 victory in threatening fashion.
Slovakia's Zuzana Zlochova trumped Aussie qualifier Karolina Wlodarczak 6-2 4-6 6-4.
Zlochova will take on third seed Erika Sema in the second round.
Thailand's Noppawan Lertcheewakarn edged past Croatian qualifier Ema Mukulcic 6-4 6-4 and will face Erika's sister, Yurika, the seventh seed, in the next round.
Isabella Holland made a good start to the tournament on her comeback from injury.
The 2011 runner-up overpowered Naiktha Bains 7-5 in the first set and scores were locked 5-all in the second when rain stopped play for the day.
Varatchaya Wongteanchai led 6-4 2-5 when Daiana Negreanu retired.