Serena Williams Shocked by Roberta Vinci At U.S. Open, Loses Grand Slam

Greg DeMarco

The U.S. Open tennis championships will continue through the weekend, but will do so without Serena Williams. The world's top-ranked tennis player, vying to complete the first Grand Slam of her career (and the fourth, historically, in women's tennis), fell in defeat to Italy's Roberta Vinci. Vinci defeated Williams in three sets, 2-6, 6-4 and 6-4. Vinci was a 300-to-1 underdog headed into Friday's match with Williams, the tournament's top-seeded woman.

Serena commented after the loss, giving credit to her opponent.

"She played literally out of her mind... I don't feel pressure, I never feel pressure."

Saturday's final will mark the first time two Italians compete in the U.S. Open women's final, as well as the first time it will be contested by two women over the age of 30.

Serena overcame a quarterfinal match-up with her sister, Venus, prior to facing Vinci in the semifinal round. Williams cited being tired but appeared ready for a Friday showdown that was delayed a day due to rain.

Serena sat down with CNN's Rachel Nichols to put her U.S. Open bid into perspective.

Serena's first non-calendar Grand Slam came with her 2003 Australian Open victory, defeating her sister Venus in the finals. In total, eight of Serena's Grand Slam victories have come over her sister.

The 2015 Wimbledon Championship marked Serena Williams' second non-calendar-year Grand Slam, completed in July of this year.

[Photo by Matthew Stockman/Getty Images]