Lorena Ochoa made a whopper that might cost her a chance to win her first major and move to No. 1 in the world.

The 25-year-old Mexican star whiffed a flop shot on her way to a quadruple bogey on the par-3 17th hole today, leaving Pak and Suzann Pettersen atop the leaderboard at Mission Hills in a major that no one seems to want to win.

Pak overcame some short-game gaffes over the closing holes with a birdie putt from the back of the green that dropped on its final turn, leaving her with a 2-under 70 and a chance to capture the last leg of the Grand Slam.

Pettersen chipped to 18 inches for tap-in birdie on the 18th for a 71 that allowed her to join Pak at 4-under 212.

When a wild day in the desert finally came to a close, the Kraft Nabisco was up for grabs.

Paula Creamer had a wedge into the par-5 18th and walked off with a three-putt bogey for a 73 that put her one shot behind along with Meaghan Francella (69). Big-hitting Brittany Lincicome eagled the final hole for a 71 and was another shot behind.

But the buzz came from Ochoa, for all the wrong reasons.

She was one shot behind Creamer on the 17th when her tee shot clipped a tree and her pitch to a back left pin went long into grass so deep she could barely see the ball. Trying to hit a flop shot, the club slid under the ball. Her fourth shot ran down the ridge some 45 feet away. Three putts later she had a 7 on her card and was no longer in the top 10.