Today at U.S. Open: Pennetta Defeats Vinci in Finals, Announces Retirement

Flavia Pennetta of Italy reacts after defeating Simona Halep of Romania in their women's singles semi-final match at the U.S. Open in New York on September 11. Carlo Allegri/Reuters

Updated | Italy's Flavia Pennetta defeated countrywoman Roberta Vinci in the women's finals on Saturday afternoon, 7-6(4), 6-2, on the 13th day of the U.S. Open.

After winning her first major title, Pennetta announced plans to retire, saying, "This is the way I would like to say goodbye to tennis," according to press reports.

Pennetta reached the final by pulling off an upset, topping Romania's Simona Halep, the No. 2 seed.

Vinci, meanwhile, got there by scoring an upset for the ages, defeating American tennis superstar Serena Williams, the No. 1 seed, who was two matches away from winning a rare calendar-year grand slam.

On the men's side, top seed Novak Djokovic of Serbia will compete against No. 2 Roger Federer of Switzerland in the final at 4 p.m. ET on Sunday.

The final of each year's four Grand Slam tournaments, the U.S. Open is held in late August and early September at the United States Tennis Association (USTA) Billie Jean King National Tennis Center in Flushing Meadows, New York.

Fans can check the schedule for the latest scheduling updates, or watch the tournament on ESPN and WatchESPN.

This story has been updated to include the latest information about the finals.