West Palm Beach, Fla. ? Annika Sorenstam was right where everyone expected her to be Thursday — on top of her game and at the top of the leaderboard in the season-ending ADT Championship.

The surprise was who joined her.

Se Ri Pak thought about going home before the first round even started. She has an impacted tooth that has kept her from eating solid food the last week, leaving her body so weak that a golf club felt as heavy as a sledge hammer.

“It’s too much pain,” Pak said. “I shouldn’t be here. However, I’m here. I’ll try my best.”

Sorenstam and Pak, the top two players on the LPGA Tour this year, traded birdies and avoided major mistakes on a balmy, breezy day at Trump International to tie for the lead at 5-under 67, along with Meg Mallon.

Pak has had her best season on tour, with five victories and her fourth major. That has been lost in another spectacular year by Sorenstam, whose 10 victories are the most on the LPGA Tour in 34 years.

Defending champion Karrie Webb had a 3-under 69, despite taking bogey on the 18th hole and missing a 2-foot par putt on No. 14. She was joined by Kelly Robbins, Lorie Kane of Canada, Rosie Jones and Patricia Meunier-Lebouc of France.

Beth Bauer, the LPGA rookie of the year, was among those at 70.