Both Jelena Jankovic and Ana Ivanovic reached the top of the women's tennis world, but it was Jankovic who finished as the year-end No. 1 for the first time in her career (despite having never won a major title).

The 23-year-old Belgrade native outdueled Serena Williams for the year-end top spot by piling up a co-tour-best 65 match wins (65-19), including four titles. She also landed in her first-ever Grand Slam final, only to lose to Serena at the U.S. Open.

Williams rallied for a 6-7 (5-7), 6-0, 6-2 triumph to capture the season- ending event for the first time in her career.

In her only two prior appearances, she lost in the semifinals.

Doha, Qatar

Total Prize Money: $4,550,000

Vera Zvonareva (8) leads Venus Williams (7), 3-0

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Williams, the seventh seed, downed top-seeded Serbian Jelena Jankovic 6-2, 2-6, 6-3 at Khalifa Tennis Complex.

Williams improved to 4-5 in her career against Jankovic and avenged losses in Rome and Stuttgart earlier this year.

Doha, Qatar

Total Prize Money: $4,550,000

Jelena Jankovic (1) vs. Venus Williams (7) Elena Dementieva (5) leads Vera Zvonareva (8), 2-1

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1 Jelena Jankovic to win her round-robin group, while Serena Williams pulled out here on Friday, giving two-time major runner-up Elena Dementieva a walkover into Saturday's semifinals at the season-ending $4.55 million Sony Ericsson Championships.

The eighth-seeded Olympic bronze medalist Zvonareva went a perfect 3-0 in this week's four-woman White Group, including a big 2-6, 6-3, 6-4 come-from-behind victory over the U.S. Open runner-up Jankovic on Day 4 at Khalifa Tennis Complex.

Doha, Qatar

Total Prize Money: $4,550,000

Jelena Jankovic (1) leads Vera Zvonareva (8), 6-2, 2-1 Serena Williams (3) vs. Elena Dementieva (5) Ana Ivanovic (4) vs. Svetlana Kuznetsova (6)

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The U.S. Open runner-up Jankovic (2-0) secured a berth in Saturday's semifinals with a 7-6 (8-6), 6-4 victory over sixth-seeded Russian Svetlana Kuznetsova, while a seventh-seeded Williams (3-0) also landed in the final four here by coming back to paste her younger sister Serena 5-7, 6-1, 6-0 at Khalifa Tennis Complex. The 0-2 Kuznetsova has been eliminated from semifinal contention.

Jankovic, who heads up this week's four-player White Group, has already clinched the year-end No. 1 ranking for the first time in her career.

Doha, Qatar

Total Prize Money: $4,550,000

Jelena Jankovic (1) leads Svetlana Kuznetsova (6), 3-2 Dinara Safina (2) vs. Elena Dementieva (5) Serena Williams (3) vs. Venus Williams (7)

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A third-seeded former world No. 1 Serena saw her first action of the week and moved to 1-0 in the four-player Maroon Group with a 6-4, 6-1 pasting of second-seeded French Open and Olympic runner-up Dinara Safina, who is a disappointing 0-2 already this week and has all but been eliminated from semifinal contention this weekend.

In another Maroon Group bout, a seventh-seeded former top-ranked Venus snuck past fifth-seeded Olympic gold medalist Elena Dementieva 6-4, 4-6, 6-3 on Day 2 on the hardcourts at Khalifa Tennis Complex. Venus is now 2-0 and appears well on her way to the semis, while Dementieva fell to 0-1.

Doha, Qatar

Total Prize Money: $4,550,000

Dinara Safina (2) vs. Serena Williams (3) Vera Zvonareva (8) leads Ana Ivanovic (4), 4-1 Elena Dementieva (5) vs. Venus Williams (7)

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The top-seeded Jankovic handled fourth-seeded fellow Serb Ana Ivanovic 6-3, 6-4 on Day 1 at Doha's Khalifa Tennis Complex.

The U.S. Open runner-up Jankovic moved to 1-0 in the four-player White Group, while Ivanovic dropped to 0-1. Ivanovic is the reigning French Open champ and was the runner-up at the Australian Open back in January.

Doha, Qatar

Total Prize Money: $4,550,000

Jelena Jankovic (1) vs. Ana Ivanovic (4) Dinara Safina (2) vs. Venus Williams (7) Vera Zvonareva (8) leads Svetlana Kuznetsova (6), 6-2, 1-0

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The 2008 edition of this event will commence with an all-Russian bout between sixth-seeded Svetlana Kuznetsova and eighth-seeded Vera Zvonareva. Kuznetsova is a former U.S. Open champion and former U.S. and French Open runner-up.

The second match on Day 1 will pit world No. 1 Jelena Jankovic against fourth- seeded fellow Serb Ana Ivanovic, a former top-ranked performer. Jankovic was this year's U.S. Open runner-up, while Ivanovic captured the French Open and reached the final at the Australian Open.

Doha, Qatar

Total Prize Money: $4,550,000

Jelena Jankovic (1) vs. Ana Ivanovic (4) Dinara Safina (2) vs. Venus Williams (7) Svetlana Kuznetsova (6) vs. Vera Zvonareva (8), 9:00 AM ET

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The top-seeded Petrova rallied for a 4-6, 6-4, 6-1 triumph to earn her ninth career title and second of 2008. She also captured the crown in Cincinnati before the U.S. Open.

Mattek, seeded sixth, had never before reached a WTA final. She lost in the semifinals twice earlier this year -- at Birmingham before Wimbledon and at the East West Bank Classic in Los Angeles in July.

Quebec City, Canada

Total Prize Money: $175,000

Nadia Petrova (1) def. Bethanie Mattek (6), 4-6, 6-4, 6-1

Nadia Petrova (1) def. Angela Haynes, 6-1, 6-3 Bethanie Mattek (6) def. Aleksandra Wozniak (5), 7-6 (7-4), 6-3

Nadia Petrova (1) def. Melinda Czink, 6-1, 6-4 Aleksandra Wozniak (5) def. Galina Voskoboeva, 6-2, 6-2 Bethanie Mattek (6) def. Melanie Oudin, 7-6 (9-7), 6-1 Angela Haynes def. Nathalie Dechy, 2-6, 7-6 (7-2), 6-3

Nadia Petrova (1) def. Varvara Lepchenko, 6-2, 6-4 Aleksandra Wozniak (5) def. Carly Gullickson, 6-3, 6-2 Bethanie Mattek (6) def. Valerie Tetreault, 7-6 (7-4), 3-6, 7-6 (7-1) Nathalie Dechy def. Olga Govortsova (7), 6-1, 7-5 Galina Voskoboeva def. Rebecca Marino, 6-1, 6-3 Melinda Czink def. Julie Ditty, 6-1, 6-1 Angela Haynes def. Severine Bremond, 6-2, 6-4 Melanie Oudin def. Olga Puchkova, 6-1, 7-6 (7-3)

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Quebec City, Canada

Total Prize Money: $175,000

Nadia Petrova (1) def. Angela Haynes, 6-1, 6-3 Bethanie Mattek (6) def. Aleksandra Wozniak (5), 7-6 (7-4), 6-3

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The world No. 11 Petrova handled Hungarian Melinda Czink 6-1, 6-4 at PEPS at Laval University.

Canada's Aleksandra Wozniak, the fifth seed, had no problems in her matchup with Russia's Galina Voskoboeva 6-2, 6-2.

Quebec City, Canada

Total Prize Money: $175,000

Nadia Petrova (1) vs. Melinda Czink Aleksandra Wozniak (5) vs. Galina Voskoboeva Bethanie Mattek (6) vs. Melanie Oudin Angela Haynes vs. Nathalie Dechy

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The fifth-seeded Wozniak made quick work of her opponent, defeating Gullickson by a 6-3, 6-2 margin. She will meet Galina Voskovoeva in the quarters after the Kazakhstani defeated Canadian Rebecca Marino 6-1, 6-3.

In other second-round action, France's Nathalie Dechy upset seventh-seeded Belarusian Olga Govortsova 6-1, 7-5 and American Angela Haynes handled Frenchwoman Severine Bremond 6-2, 6-4. Dechy and Haynes will meet here on Friday.

Quebec City, Canada

Total Prize Money: $175,000

Aleksandra Wozniak (5) vs. Carly Gullickson Olga Govortsova (7) vs. Nathalie Dechy Galina Voskoboeva vs. Rebecca Marino Severine Bremond vs. Angela Haynes

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The Russian Petrova had little trouble in dispatching American qualifier Varvara Lepchenko, 6-2, 6-4.

Meanwhile, the American Mattek struggled to get past Canadian wildcard Valerie Tetreault, needing a pair of tiebreak set wins. Mattek toughed out a 7-6 (7-4), 3-6, 7-6 (7-1) win.

Quebec City, Canada

Total Prize Money: $175,000

Nadia Petrova (1) vs. Varvara Lepchenko Bethanie Mattek (6) vs. Valerie Tetreault Melanie Oudin leads Olga Puchkova, 2-1 Julie Ditty vs. Melinda Czink

Jill Craybas vs. Rebecca Marino

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The world No.

11 Petrova pasted fellow Russian Maria Mokh 6-1, 6-2.