NEW YORK (AP):Talk about going out on top: Flavia Pennetta won the US Open for her first Grand Slam title at age 33 and then announced during the trophy ceremony she has decided to retire.Pennetta did not have to beat Serena Williams in the final. Instead, Pennetta needed to get past the woman who ended Williams’ Grand Slam bid, Roberta Vinci. And Pennetta was able to do just that, pulling away in a matchup of Italians who were opponents and doubles partners as kids.In one of the unlikeliest major finals in women’s tennis history, the 26th-seeded Pennetta beat Vinci 7-6 (4), 6-2 at Flushing Meadows yesterday – then revealed she was ready to hang up her racket, a decision she kept private until that moment.”This is how I say goodbye to tennis,” Pennetta said as her fiancÈ, tennis player Fabio Fognini, captured the scene with his phone’s camera. “I couldn’t think to finish in a better way.”That announcement served as a perfectly out-of-nowhere conclusion to a surprise-filled tournament, the biggest shock being Vinci’s win against Williams in the semi-finals on Friday. That stopped Williams’ 33-match winning streak in majors and her attempt to become the first player since Steffi Graf in 1988 to win all four Grand Slam tournaments in a single season.”I passed 24 hours with a lot of things on mind,” Vinci said. “And I was a little bit tight, especially in the first set.”Pennetta is the oldest woman in the Open era, which began in 1968, to become a Grand Slam champion for the first time. Vinci, who is 32, would have earned that distinction had she been able to follow her stunning upset of Williams in Friday’s semi-finals with another victory.This was the first major final for either participant and the first time since WTA computer rankings were instituted in 1975 that both US Open women’s finalists were ranked outside the top 20 (Vinci is 43rd). Pennetta entered the tournament with only a 17-15 record this season. Vinci was 20-20 in 2015 and 40-43 in majors for her career.Clashing for two decadesThey grew up 40 miles (65 kilometres) apart in coastal towns in Puglia, a region on the heel of Italy’s boot-shaped peninsula, and have been facing each other on court for two decades – with the stakes much lower, of course. They shared laughs and tears in the locker room Friday while watching a video of a TV interview they did back in 1999, when they won the French Open junior doubles title as teenagers.”It’s tough,” Vinci acknowledged, “to play against one player that you know (for a) long time.”And when yesterday’s match ended, after Pennetta flung her racket overhead, she went up to the net to find Vinci, not for a handshake but for a lengthy hug. Vinci patted her pal on the back repeatedly, while Pennetta cried. Then they sat on adjacent sideline chairs and chatted, just a couple of foes and friends.Vinci pantomimed throwing a punch as a joke, and Pennetta wrapped an arm around her. Vinci charmed the crowd later, saying she wanted the champion’s trophy, not the one for the runner-up, then pretending to steal Pennetta’s $3.3 million check.”We know each other since forever,” Pennetta said. “We spend so much time together, we could write a book about our lives.”Quite a chapter yesterday would provide.