U.S. Open 2015: Flavia Pennetta wins title, will retire

Pennetta beat childhood pal and fellow Italian Roberta Vinci 7-6 (4) 6-2 in the title match in New York, a day after the runner-up engineered one of the biggest shocks in tennis history by ousting Serena Williams.

Speaking of shocks, Pennetta then said in her on-court interview Saturday she was retiring from tennis. At first it was thought Pennetta was stopping now but she later told reporters she'll finish the season.

She made the decision at a tournament in Toronto last month.

"Sometimes it's getting hard for me to compete," Pennetta said, referring to the mental struggle of playing tennis throughout the 11-month season. "I don't feel to have this power anymore sometimes.

"So this is the perfect moment. Was a really hard decision to make, but I'm happy that I did it. I'm really happy and proud of myself."