Serena Willes’ fifth PGA TOUR title at Oakmont put her third PGA title and second PGA tour title in the books on Sunday.
Williams’ win came at the age of 29, the same age she won her first two PGA titles in 2013 and 2014.
She also became the youngest player in PGA history to win a major championship.
Willes, who is coming off a win at Augusta National and a No. 4 finish in the FedExCup Playoffs, finished with a five-under-par 67.6 percent on the day.
She shot an average of 69.7 on the course.
Williams, who won her second major title in May, has won her last four PGA tours and is on pace to win the last two of her five majors.
She was 3-under over her last five tournaments, and finished with three bogeys and a 69.8 percent.
She made birdies on four of her last six holes, including a bogey-free 12th hole.
She also shot two birdies in the second round.
Williams has won two majors at the Masters and three at the U.S. Open, all in a row.
She has the most wins in a season by a PGA champion in history at 28.