SPRINGFIELD, Ill. – Michelle Wie finished the third round of the State Farm Classic alone in second on Saturday – that is, if she hadn't already been disqualified.

Wie failed to sign her scorecard after Friday's second round. She showed up Saturday and shot 5-under 67 to finish alone in second at 17 under, one stroke back of Yani Tseng. That's when Wie learned of the LPGA's ruling.

The 18-year-old Wie, who appeared to have been crying, told reporters she made a mistake.

“I don't know how it happened,” she said.

Wie, who is playing a part-time schedule while attending Stanford, was having by far her best tournament of the year. She opened with a 5-under 67 and followed with rounds of 65 and 67 – though the last two won't count.