Updated at 3 p.m. ET: Serena Williams Out
The World No. 1 Serena Williams was upset by the unseeded Roberta Vinci of Italy 2-6, 6-4, 6-4, ending her quest to win the first calendar Grand Slam since 1988. Williams left the court immediately after the match. In her post-match interview, Vinci was all smiles and credited her win to being able not to "think about that [it was] Serena on the other court."
Updated at 12:30 p.m. ET: Pennetta Wins
The 26th-seeded Flavia Pennetta upset the No. 2 seed, Simona Halep, 6-1, 6-3.
Our original post continues below:
Serena Williams will continue her quest for a calendar Grand Slam on Friday morning, when her delayed match against Italy's Roberta Vinci in the U.S. Open semifinals finally begins.
The Williams-Vinci match is slated as the second of the day at Arthur Ashe Stadium; it's set to follow the semifinal match between tournament No. 2 seed Simona Halep and No. 26 seed Flavia Pennetta — who began playing about 20 minutes after their scheduled 11 a.m. ET start time.
The semifinals were rescheduled for Friday after heavy rains hit New York City Thursday night. That means the players who reach Saturday afternoon's final will be on shorter rest than they might have expected.
We'll update this post with news from the match.
As the Two-Way reported earlier this week, Williams "has already won the 'Serena Slam' twice, holding all four major titles consecutively both in 2014-15 and 2002-03, but she has yet to win them all in one calendar year. The last player, male or female, to do so was Steffi Graf in 1988."
Here's how the tournament's website describes Vinci's path to the semifinal against Williams:
"Vinci, a 32-year-old tour vet, has advanced to this point through a combination of great play and bad luck. What figured to be her toughest test — a fourth-round face-off with the No. 25 seed Eugenie Bouchard — resulted in a walkover for the Italian after Bouchard was forced to withdraw with a concussion. But take nothing away from the gritty Vinci, who has toughed out three three-set wins in reaching her best major showing. Best known as one of the women's game's premier doubles talents, Vinci owns five career Slam doubles crowns, and she has achieved a career Grand Slam playing in pairs."
Williams is also making news for her response to a question at a news conference Tuesday night after defeating her older sister, Venus, in the quarterfinals. That's when a reporter noted that she wasn't smiling and asked, "What's wrong?"
"It's 11:30. To be perfectly honest with you, I don't want to be here. I just want to be in bed right now and I have to wake up early to practice. And I don't want to answer any of these questions, and you guys keep asking me the same questions. So, it's not really — you're not making it super enjoyable."
With a laugh, Williams finally cracked a smile, and said, "Just being honest."