If her first year of playing professional golf in the United States is having any ill effects on 18-year-old Pajaree Anannarukarn, she certainly is not showing it.

The Symetra Tour rookie from Thailand owns four top-10 finishes in four tournaments, and she served notice Thursday that she’s ready to challenge for her first career victory. She fired a 6-under-par 65 to tie for the opening-round lead of the Valley Forge Invitational at Raven’s Claw Golf Club in Limerick Township...

Continued on Philly.com