Ukrainian Kateryna Bondarenko has shocked 23rd seed Svetlana Kuznetsova in their second round Australian Open clash.
World No.92 Bondarenko broke through for her first win over the Russian with a 6-1 7-5 victory.
It looked like Bondarenko would wrap it up comfortably, leading 4-1 in the second, but Kuznetsova, a two-time grand slam champion, clawed her way back to 5-5.
Bondarenko, who took time off the tour to have a daughter in 2013, broke her opponent and then served out the match.
The result matches Bondarenko's previous best performance at Melbourne Park, reaching the third round in 2009.
She won the Australian Open women's doubles with her sister Alona in 2008.
Earlier Maria Sharapova breezed into the third round with a 6-2 6-1 win over Belarusian Aliaksandra Sasnovich.
The Russian veteran, seeded five at Melbourne Park, made short work of the world No.105.
She raced to a 4-0 lead in the first set before wrapping it up in 38 minutes and completed the second in similar style.
Sharapova won the Open in 2008 and finished runner-up last year.