(CNN) -- Former world No.1 Ana Ivanovic's dismal run of recent form has continued after she was beaten 7-5 6-7 6-2 by Russian teenager Alisa Kleybanova in the third round of the Australian Open in Melbourne.
Kleybanova celebrates 'the best win of her career' after defeating Ana Ivanovic in Melbourne.
The 19-year-old survived a second-set comeback from fifth seed Ivanovic to secure a last 16 showdown with Australian Jelena Dokic, who maintained her fairytale return to the big-time with a 3-6 6-1 6-2 victory over 11th-seeded Dane Caroline Wozniacki.
Ivanovic, last year's beaten finalist, fought for nearly three hours against the sheer power of her opponent, who hammered an impressive 36 winners to eventually get past past the Serb.
Kleybanova described the win as "the best match in my career so far".
"It's just great to play a match like this. I'm so happy that I pulled through, because it was not just a normal win. I really felt that I played almost my best tennis today. It was so exciting to be out there," the 29th seed told the official Australian Open Web site.
Meanwhile, former world No.4 Dokic, continued her remarkable Grand Slam revival, as Wozniacki went the same way as 17th-seeded Russian Anna Chakvetadze.
Dokic, whose previous best performance at her home Grand Slam came back in 1999 when she reached the second round, had to win December's wildcard playoff just to qualify for the tournament.
Elsewhere, top seed Jelena Jankovic continued her smooth progress into the fourth round with a 6-4 6-4 win over Japan's Ai Sugiyama, while third seed Dinara Safina of Russia cruised past Kaia Kanepi of Estonia 6-2 6-2.