Sara Errani romped to a 6-1 6-1 win over Alisa Kleybanova in Cagliari to hand Italy their third Fed Cup title in five years.
Laura Robson lost to a woman 24 years her senior as she went out in the opening round of the Japan Open.
Serena Williams set up a re-match of last year's US Open final against Victoria Azarenka with a 6-0 6-3 win over Li Na.
Flavia Pennetta's dream of a first Grand Slam final was crushed by Victoria Azarenka but she was still proud of her US Open.
A confident Victoria Azarenka will get a chance to avenge last year's US Open final defeat to Serena Williams.
Second seed Victoria Azarenka overcame an at-times erratic serve to beat Flavia Pennetta 6-4 6-2 and reach the US Open final.
Serena Williams and Victoria Azarenka are one step away from booking a tantalising championship rematch at the US Open.
The paths to the US Open women's semi-finals to be played on Friday at the US National Tennis Center in Flushing Meadows.
Order of play for day 12 of the US Open, with semi-finals between Serena Williams and Li Na, and Flavia Pennetta and Victoria Azarenka.
Victoria Azarenka beat Daniela Hantuchova 6-2 6-3 to set up a US Open semi-final clash with Italy's Flavia Pennetta.
Flavia Pennetta's journey to the last four of the US Open has been one of the more unexpected successes for Italy.
ATP World Tour Finals
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