The 29-year-old American beat Russian Anna Chakvetadze 6-3, 6-3 to move into the final of the US Open tune-up event.

With her victory, Davenport captured her number one crown back from Russian Maria Sharapova who had dethroned her earlier this week for the first time.

Sharapova will be the top seed at next week's US Open regardless of her world ranking.

In the other semifinal on Friday, Amelie Mauresmo narrowly escaped defeat.

Down a set and a break, the second-seeded Frenchwoman regrouped to outlast Spains Anabel Medina Garrigues 4-6, 7-6 (7/5), 6-2 in two hours and 52 minutes.

Giant killer Medina Garrigues missed her chance to nail another big seed after beating fourth-seeded Russian Elena Dementieva in the quarter-finals.

Mauresmo, 26, slumped from the outset and played well below her best. The Spaniard, ranked 33rd, made third-ranked Mauresmo twist and turn before closing out the set on her serve.