This was Kim's fourth top-four finish at a U.S. Women's Open, but she's still seeking her first major title. She was a foot away last year at the Kraft Nabisco, then missed a short putt on No. 18 that would have clinched the championship and went on to lose in a playoff.
Asked if she feels she's on the verge of a major breakthrough, Kim paused for a moment then said: "Yeah, to be honest, yeah, it's time to win it."
"But I think things have to come naturally," she added, "and it's great to play with Inbee, and she's doing so well. Seeing her doing it, it just makes me want it more."
Americans Paula Creamer (72) and Angela Stanford (74) and England's Jodi Ewart Shadoff (76) tied for fourth at 1 over. Shadoff was alone in third at 3 under after the third round but opened Sunday with three straight bogeys.
Soon-to-be Oklahoma State player Casie Cathrea shot 70 on Sunday to match Shanshan Feng for the best round of the day and finish as the low amateur at 9 over. Lydia Ko, the 16-year-old New Zealander who won the Canadian Open last August to become the youngest LPGA Tour winner, was next at 11 over.
Park also became the second player to win the U.S. Women's Open after victories in her previous two tournaments. Mickey Wright did it in 1964.
The 24-year-old Park won the Kraft Nabisco and LPGA Championship for her first two major titles of the year. Up next is the Women's British Open at St. Andrews on Aug. 1-4.
The Evian Championship is Sept. 12-15. Park won the French event last year before it became a major championship.
Park contemplated the current definition of a Grand Slam.
"So I think the British Open is one I have to win," she said. "So it would be great if I could win five, but I still think four means a Grand Slam.
Laughing, she added: "I think four out of five is very big."