US Open Tennis 2015 Semifinals Rescheduled: New TV Info, Start Times and More

Serena Williams' quest to take the next step toward tennis history will have to wait another day. The U.S. Open announced the women's semifinals scheduled for Thursday night are being moved to Friday morning due to the weather forecast, as noted by Tennis.com.

The tournament confirmed the penultimate round on the women's side will now begin at 11 a.m. ET Friday morning. Williams continues her bid for the calendar Grand Slam against Roberta Vinci, and second-seeded Simona Halep battles Flavia Pennetta for the other place in the title match.

Moving the women's matches will also impact the men's semifinal schedule. The U.S. Open tweeted those will move back two hours Friday to 5 p.m. ET. Novak Djokovic will take on Marin Cilic for a spot to face the winner of a Swiss clash between Roger Federer and Stan Wawrinka.

All matches will be televised on the ESPN family of networks.

Of course, all eyes are on Williams as she attempts to accomplish a feat that hasn't been witnessed since Steffi Graf in 1988. The extra day of rest may benefit the top-ranked player in the world as she regroups after an emotional three-set victory over her sister, Venus Williams, in the quarterfinals.

Afterward, she admitted playing a sibling with so much on the line isn't an easy task, as noted by Motez Bishara of CNN.

"It's a really great moment, she's the toughest player I've ever played in my life and the best person I know," Serena said. "It's going against your best friend, and at the same time going against the greatest competitor for me in women's tennis. So it was really difficult today."

Serena is a massive favorite—currently minus-2,000, according to Odds Shark—against Vinci, and given her level of play in recent rounds, it would be a shock if she didn't finish the job. But the mounting pressure could wreak havoc on an otherwise seemingly inevitable result.

As for the men's semifinals, the slight time change shouldn't have much effect. All four players are accustomed to playing at this stage of a major tournament and will adjust accordingly. Based on the amount of star power, one or both matches could become instant classics.

All told, Friday should be a memorable day of tennis at the USTA Billie Jean King National Tennis Center in New York City.