Serbia's Djokovic capped the night session on stadium court with a 6-3, 6-2 victory over Germany's Philipp Kohlschreiber.

Unseeded South Korean Lee Hyung-Taik, ranked 52nd in the world, pulled off the upset of the day, downing world No 5 and fifth seed David Ferrer of Spain 7-6 (5), 6-7 (5), 7-6 (3).

Women's top seed Ana Ivanovic of Serbia advanced with ease, downing Italy's Tathiana Garbin 6-3, 6-0.

Ivanovic, whose runner-up finish to Maria Sharapova at the Australian Open propelled her to No 2 in the world, was pleased to turn in a solid performance after her erratic 6-1, 5-7, 6-0 victory over Romanian Ioana Raluca Olaru in the previous round.

"I'm definitely better," she said. "That's very positive, and I finished the match strong and did some things I was practicing and working on, so I'm happy about that."

Ivanovic's third-seeded compatriot Jelena Jankovic also cruised into the fourth round, posting a 6-1, 6-1 victory over Japanese veteran Ai Sugiyama.

Jankovic, ranked No 4 in the world, encountered little resistance from Sugiyama and said her biggest concern was to maintain her focus in the breezy conditions.

"I really tried to do my job out there. I didn't want to let her get into the match," she said.

(Agencies via China Daily March 19, 2008)