(CNN) -- Serbian stars Jelena Jankovic and Ana Ivanovic scored straight sets wins as they stepped up their Australian Open challenge in Melbourne on Wednesday.
French Open champion Ivanovic reached the third round with a straight sets win.
Top seed Jankovic needed one hour and 46 minutes to see off Belgium's Kirsten Flipkens 6-4 7-5 while fifth-ranked Ivanovic beat Italian qualifier Alberta Brianti 6-3 6-2.
Jankovic, chasing her first grand slam title, had to save eight break points in the second game of the match before breaking Flipkens' sevice in the ninth game.
Jankovic served out for the opener, but found herself 3-1 down in the second set before reeling off three straight games.
Flipkens, the world 110, bravely leveled for 4-4 but Jankovic broke again to reach the third round.
"I wasn't really happy with my game and I'll have to clean up my game a little bit and try to do the right things for my next match," Jankovic was quoted on the official tournament Web site www.australianopen.com.
The 23-year-old will meet Ai Sugiyama in the third round after the Japanese player scored a 1-6 6-1 6-3 win against France's Natalie Dechy.
French Open champion Ivanovic struggled with her service in getting past Brianti, but was never under serious pressure and will play Russian Alisa Kleybanova in the last 32.
Third seed Dinara Safina had to come from a set down to beat fellow-Russian Ekaterina Makarova 6-7 6-3 6-0.
Unforced errors undermined Safina, the sister of former men's champion Marat Safin, who woke up after her first set reverse.
"Once I lost it, I was like, 'If I don't change, I'll go home'," she said.
Russian Vera Zvonareva, the seventh seed, whitewashed Edina Gallovits 6-0 6-0 while other seeds to progress included Alize Cornet, Daniela Hantuchova, Marion Bartoli, Nadia Petrova, Kaia Kanepi and Caroline Wozniacki.