Both players struggled on serve at the start of the match, with five straight breaks, before the 18th-ranked Chakvetadze held to establish a 4-2 lead and went on to take the opener.

The second set followed a similar pattern, with four breaks of serve in a row to leave the scores at 3-3. A nervous Dulko, ranked 49, missed a simple overhead on her second set point but was reprieved when Chakvetadze missed a straightforward backhand volley on the following point.

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The decider went with serve until the ninth game, when a deft volley by Dulko at the net gave her the crucial break and she served out for victory.

Wimbledon champion Williams is due to take on World No 7 Zvonareva later today, which will be followed by a doubles clash featuring Williams and Coco Vandeweghe against Chakvetadze and Alexandra Panova.

On Friday, Williams beat Chakvetadze 7-6 (7/1), 6-3 to give the Americas the lead but Russia hit back through Zvonareva, who beat Gisela Dulko 6-4, 0-6, 6-3.

Asia-Pacific won the silver group final against Europe, featuring the teams that lost their semi-final clashes earlier in the week.