Flushing Meadows, NY -- (Sports Network) - Former world No. 1 Jelena Jankovic and Olympic gold medalist Elena Dementieva were a pair of third-round victors Friday, while former champion and 2007 runner-up Svetlana Kuznetsova went by way of the upset at the U.S. Open.

A third-seeded Kuznetsova succumbed to 28th-seeded Slovenian Katarina Srebotnik 6-3, 6-7 (1-7), 6-3, as the Russian became the second top-three seed in two days to fall here.

Kuznetsova lost to Belgian Justine Henin in last year's U.S. Open final and titled here back in 2004.

Srebotnik dismissed the three-time Grand Slam finalist Kuznetsova on her third match point when the Russian misfired long on one final return. The surprise winner from Slovenia uncorked 13 aces in the 2-hour, 20-minute affair.

The second-seeded Jankovic, meanwhile, snuck past gritty Chinese Jie Zheng 7-5, 7-5 at Ashe Stadium, as the hard-hitting Serb needed 2 hours, 10 minutes to advance.

Jankovic prevailed in a wild 12th game in the second set on Day 5, as she needed five match points in an 18-minute game that went to deuce 11 times and saw Zheng enjoy seven break-point chances.

The 23-year-old Jankovic converted on her fifth match point when Zheng netted one final weak forehand.

Zheng was a surprise Wimbledon semifinalist last month. She shocked French Open champion Ana Ivanovic in the third round at the storied All England Club.

Jankovic is the highest women's seed still standing in New York, as her top- ranked countrywoman Ivanovic was a shocking second-round loser against French qualifier Julie Coin here on Thursday.

The popular Jankovic, a U.S. Open semifinalist in 2006 and quarterfinalist here last year, was ranked No. 1 for just one week two weeks ago.

Jankovic will meet Caroline Wozniacki in the fourth round this weekend. The 21-seed Wozniacki, who was last week's surprise hardcourt titlist in New Haven, toppled 14-seed Victoria Azarenka 6-4, 6-4.

A fifth-seeded Dementieva, of Russia, drove out Britain's Anne Keothavong 6-3, 6-4. The two-time major runner-up Dementieva reached the U.S. Open final four years ago and captured Olympic gold in Beijing earlier this month. She's currently riding a nine-match winning streak.

Up next for Dementieva will be Chinese Na Li, who got past Russian Ekaterina Makarova 6-1, 4-6, 6-2.

American 23-seed Lindsay Davenport gamely faced 12th-seeded Marion Bartoli, but the Frenchwoman posted a 6-1, 7-6 (7-3) triumph. Davenport titled here in 1998 and was the runner-up in 2000.

In other matches, 15-seed Patty Schnyder topped Magdalena Rybarikova 7-6 (7-4), 6-4; Sybille Bammer, the 29th seed, needed three sets to oust Ekaterina Makarova 6-1, 4-6, 6-2.