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US Open semi-finals: How Roberta Vinci stunned Serena Williams

US Open semi-finals: How Roberta Vinci stunned Serena Williams - In a huge upset, Italy's Roberta Vinci defeated world number one Serena Williams in the US Open semi-finals ending the latter's hopes of securing a calendar Grand Slam.

The 43rd-ranked Vinci was playing her first Grand Slam semi-final when she defeated Serena 2-6 6-4 6-4.

The 33-year-old Williams was just two wins away from completing a clean sweep of all four majors in 2015.

The 32-year-old Vinci will play Flavia Pennetta in an all-Italian final at Flushing Meadows on Saturday.

Pennetta, the 26th seed, defeated Romanian second seed Simona Halep in the first semi-final to win 6-1 6-3.

On Saturday, it will be the first Grand Slam final between two Italian players since the Open era began in 1968.

Williams got deeply frustrated after dropping the second set as she smashed her racquet. In the third set, she got more desperate and started losing her focus allowing Vinci to grab control of the match.

Only Maureen Connolly (1953), Margaret Court (1970) and Steffi Graf (1988) have achieved calendar Slams in the women's game.

"It was an incredible match,' said the Italian. "I lost the first set, and tried to stay in every point. I tried to stay focused and not think about Serena. It is the best moment of my life."

"I don't want to talk about how disappointing this is for me," said Williams in her post-match news conference. "If you have any other questions I'm open to that," she added.

When asked whether she felt the strain of winning the calendar Grand Slam, she added: "I never feel pressure and never felt that pressure to win here. I said that from the beginning."