Lindsay Davenport continued her comeback after giving birth and upset second-ranked Ana Ivanovic 6-4, 6-2 Sunday in the third round at the Sony Ericsson Open. Davenport left the women's tour in late 2006 to have her first child, then came back in the middle of last year. The three-time Grand Slam champion is 17-3 this year with two titles, and she rated the win over Ivanovic as her best since returning. “It's quite rewarding,” said Davenport, 31. “In this comeback, for lack of better words, I've not made a fool of myself. I've done pretty well for my age and for what I've been through. Obviously days like today just give me more intensive to keep going.” Hampered by injuries in recent years, Davenport is playing at Key Biscayne for the first time since 2003. She next faces No. 13 Dinara Safina, who rallied past No. 18 Sybille Bammer 4-6, 6-1, 6-0. Serena and Venus Williams also reached the fourth round, as did top-seeded Justine Henin. Four-time champion Serena Williams had the toughest time, overcoming 60 unforced errors and a 3-0 deficit in the second set to beat No. 27 Flavia Pennetta 6-7 (6), 6-3, 6-2. Serena said a rain delay when she trailed 3-2 in the second set helped. “My mom called me,” Serena said. “She was like, ‘Stay up. Don't get behind the baseline.' I'm like, ‘Are you here? Are you watching on TV?' She's like, ‘No, but I know you.' So I was like, ‘OK.' I just tried to listen.” No. 3 Svetlana Kuznetsova also needed a comeback. In the second set she overcame a 5-2 deficit and a match point, and she swept the final 11 games to beat No. 25 Victoria Azarenka 1-6, 7-5, 6-0. Venus Williams, seeded sixth, defeated wild card Marina Erakovic 6-2, 6-1. Henin beat Sara Errani by the same score. No. 4 Jelena Jankovic won her second match in 18 hours, beating Lucie Safarova 6-2, 6-1. The victory came after Jankovic played past midnight Saturday night, saving five match points in a third-set tiebreaker to beat Sofia Arvidsson. On the men's side, No. 2 Rafael Nadal never faced a break point and beat Nicolas Kiefer 6-2, 6-4. No. 9 James Blake outlasted 35-year-old Fabrice Santoro, 6-3, 6-7 (4), 6-4. The 20-year-old Ivanovic was the Australian Open runner-up and won Indian Wells this month. But her game unraveled against Davenport, who repeatedly swatted deep service returns and broke six times. “She played like a top 10 player easily,” Ivanovic said. “I must say I haven't played against many players who can return so well and so deep, so she puts a lot of pressure on my serve.” Ai Sugiyama edged No. 7 Daniela Hantuchova 6-4, 6-7 (8), 7-5. Other seeded women eliminated were No. 11 Patty Schnyder, No. 22 Katarina Srebotnik and No. 24 Amelie Mauresmo. On the men's side, No. 16 Paul-Henri Mathieu beat No. 20 Carlos Moya 7-6 (1), 7-5. Dmitry Tursunov rallied past No. 32 Feliciano Lopez 4-6, 6-3, 6
