The Latest on the U.S. Open (all times local):
Flavia Pennetta's first major title — and surprise retirement announcement — drew congratulations from around the tennis world.
Serena Williams, whose Grand Slam bid ended Friday with a stunning U.S. Open semifinal loss to eventual runner-up Roberta Vinci, tweeted: "congrats I'm so happy you won. You deserved it. I am also happy for the rest of your life's journey. I will miss your smile."
Pennetta is the second Italian woman to win a major championship. The first, 2010 French Open winner Francesca Schiavone, tweeted: "Fla, welcome to the club."
Some other reactions from current...