Christina Kim shot a 7-under 64 Thursday and held a one-stroke lead over Rachel Teske after the first round of the LPGA Longs Drugs Challenge.
Kim, 20, of San Jose, has four top-10 finishes this season. She didn't have a bogey on an almost windless day at The Ridge Golf Club, a 6,235-yard layout that is a new venue for the 9-year-old tournament.
"I can't remember when I did that before," said the outgoing Kim, who wore multicolored flowered pants, a pink top and her pink beret backwards.
Teske, an eight-time winner on the LPGA Tour, had four birdies and an eagle in her second nine and is one stroke ahead four players.
"I don't know what happened," said Teske, who won two LPGA events last year and has four top-10 finishes this season. "But I just really put a really good swing on the second shot into the green on No. 10 and I had that rhythm for the rest of the nine."
Ryder Cup hero Colin Montgomerie shot birdie-eagle on the last two holes for a one-under-par 71 Thursday but trailed the leaders by four strokes in the first round of The Heritage golf tournament.
Graeme McDowell, Jose Manuel Lara and Nick O'Hern shot five-under-par 67s to seize the spotlight from Europe's victorious stars.
But Montgomerie and David Howell both shot 71 while Padraig Harrington had a level-par 72. Only Ian Poulter of the victorious team's quartet in action on the Duke's Course at Woburn suffered, soaring to a five-over 77.
"The three-three finish was great because nothing much was happening," said Montgomerie, who holed the winning Ryder Cup putt Sunday at Oakland Hills.
"I am quite tired and the atmosphere was slightly different so it was sometimes difficult to get going."
He said his goal this week was to finish in the top five to get a place in the field for next week's Amex Championship at Mount Juliet, Ireland.