The French Open champion outlasted fellow Russian Vera Zvonareva in a thriller at the Acura Classic.
The Argentine realised some of her tennis dreams in Paris but was upset after her French Open semi-final loss to Elena Dementieva.
Top seed Maria Sharapova won her seventh straight match on US soil by defeating holder Elena Dementieva 6-3 6-4 in the quarter-finals of the Los Angeles Classic on Friday.
Lleyton Hewitt survived a Rainer Schuettler onslaught to advance 7-6, 2-6, 6-4 into round three of the Pacific Life Open.
The 21-year-old Dementieva dropped the first set and then rallied impresively to beat Davenport.
Number one seed Elena Dememtieva reached the final of the Paris Indoor Open for the second year running on Saturday when she recovered from a set down to beat 18-year-old American Melanie Oudin 4-6, 6-3, 6-3. The Russian, ranked number seven in the world, will face Lucie Safarova in the final after the Czech also came from a set down to overturn the Italian second seed Flavia Pennetta 4-6, 6-3, 6-4.
Former US Open champion Svetlana Kuznetsova has joined a growing list of players who have decided not to play in this year's tournament due to concerns over the COVID-19 pandemic.
Here is a list of US Open women's singles champions since the open era began in 1968:
Following Iga Swiatek's victory over Coco Gauff in the final, here's a list of French Open women's singles champions:
List of French Open women's singles champions:
Simona Halep became the first Romanian in 40 years to lift the French Open trophy at Roland Garros on Saturday.
List of French Open women's singles champions