(MEL EVANS ~ Associated Press)
She outlasted playing partner and third-round leader Cristie Kerr, who struggled from the outset in the final round and failed in her bid for a second Women's Open title in three years.
Ji recovered from two bogeys in her first four holes and a double-bogey at the 10th, making three birdies over the final six holes to finish at even-par 284 at Saucon Valley Country Club.
She is the second straight South Korean to win the event, following Inbee Park.
Candie Kung of Taiwan had a 2-under 69 and was alone in second at 1-over 285.
Despite her struggles, Kerr held the lead until the back nine and shot a 4-over 75, tying In-Kyung Kim of South Korea for third at 2-over 286.
Steve Stricker followed one of his best performances with 36 solid holes to win the John Deere Classic in Silvis, Ill., by three strokes.
Stricker, who tied the course record Saturday, fired a 7-under 64 in the fourth round after starting the day with a third-round 68 to finish at 264 for the tournament. That was good enough for his second PGA Tour win this year. Zach Johnson (64, 66), Brandt Snedeker (68, 65) and Brett Quigley (62, 67) tied for second at 17 under.
Bernhard Langer chipped in for eagle on the 18th hole Sunday to win the 3M Championship in Blaine, Minn., his second straight win on the Champions Tour.
His 7-under 65 gave him a 16-under 200 for the tournament, one shot better than Andy Bean.
-- The Associated Press