By Mark Barden at Wimbledon
Serena Williams was pushed hard by Alicia Molik but won 7-6 (7-4) 6-3 to reach the third round of Wimbledon.
Williams eventually overcame Molik's resistance
Molik inflicted two breaks on Williams in the first set but the seventh seed had two of her own and won a tie-break.
They traded breaks early in the second, but the American broke again for 4-2. Molik saved match point and held for 5-3, but Williams was not to be denied.
Top seed Justine Henin was rarely troubled by Russia's Vera Dushevina on Centre Court, easing to a 6-0 6-4 win.
Serbian third seed Jelena Jankovic had an even easier passage into the third round, beating Czech Jarmila Gajdosova 6-1 6-1.
Two-time champion Williams had plenty of praise for Molik, and said of her own performance: "I would give myself six out of 10, but I played a little better today."
Martina Hingis faced little resistance as she booked her place in the third round with a comfortable 6-1 6-2 win over Japan's Aiko Nakamura.
Hingis, the 1997 champion, had an early fright when she faced two break points in the first game. But the Swiss world number 11 never looked back after saving both, winning the opening set in just 26 minutes.
Nakamura continued to make a host of unforced errors in the second set as Hingis broke twice to claim victory, closing out on her fifth match point.
"The first game was pretty key, first couple of games, because I held serve being down 40-15," said Hingis.
"She also had game points on her own serve and didn't make it. Then I just swept through the first set, broke her down a little bit mentally that she could not finish the games.
"I'm just really looking to the next step because I'm building up, I can only get better. Every day I'm winning on condition and match practice, also confidence."
French Open finalist Ana Ivanovic took her place in round two with a 6-0 7-5 (7-3) win over Hungary's Melinda Czink.
Ivanovic reached the fourth round last year
The sixth seed made a strong start and wrapped up the first set in just 18 minutes before Czink woke up and broke back at the start of the second.
After a 40-minute rain delay, the Serb sixth seed broke back. Czink saved a match point before losing a tie-break.
Ivanovic admitted the rain break helped her to dampen Czink's second-set recovery.
"I was happy when it happened," said the 19-year-old. "It helped me a lot because I could take some time and look at what I was doing wrong."
Also in the second round is Czech 14th seed Nicole Vaidisova, who beat Karin Knapp 7-6 (8-6) 6-2. Her Italian opponent hit seven aces but five double faults.
Russian 12th seed Elena Dementieva reached the second round by beating France's Nathalie Dechy but was made to work hard in the second set of her 6-2 7-6 (9-7) win.