HARRISON, N.Y. >> Sei Young Kim of South Korea has already won twice in her rookie season on the LPGA Tour. 

Now the 22-year-old is taking aim at a major title, making an eagle on the 15th hole for a 5-under 68 Friday and a one-shot lead after the second round of the KPMG Women’s PGA Championship.

Kim overtook Hall-of-Famer Karrie Webb, who birdied the 18th for a 71. Kim, who turned pro in 2010 and played on the LPGA of Korea Tour, shot bogey-free golf to finish at 8-under 138 at the Westchester Country Club. 

“My goal for this year is to become top five,” Kim said through an interpreter, “and if I win a major, I could be one step closer.”

Two-time defending champion Inbee Park (68) joined Webb a stroke back.   

Suzann Pettersen rallied with seven birdies for the best round of the day at 66 and tied Canadian teenager Brooke Henderson (73) at 6 under. Overnight leader Jenny Shin (75) and third-ranked Stacy Lewis (71) were three shots behind the leader. 

Pettersen improved her score from the opening round by eight shots, making seven birdies from No. 5 to No. 15. Coached by Butch Harmon, Pettersen was coming off a win in Canada.

“I felt my speed of the greens was a little bit off yesterday. But stuck to the game plan,” she said. “I didn’t practice much after. I’m right where I want to be.”

Top-ranked Lydia Ko (76) missed the cut, which was 2 over, ending her streak of 53 consecutive made cuts. She had a double bogey on No. 2 to start her day and finished with four bogeys and three birdies.

“I just made a double and just couldn’t get anything turned around,” said the 18-year-old from New Zealand. “I missed a lot of 9-footers. I made two good putts the last two holes; it was already kind of too late.”

Kim won LPGA Tour events in the Bahamas and Hawaii this year. She said she likes the West Course, and watched a talented male pro play on the longtime home of the PGA Tour event now called The Barclays.

“I was inspired by Tiger Woods, how he was able to make shots and shot-making,” Kim said. 

The 40-year-old Webb had three birdies and a bogey on the par-3 16th on another steamy day with temperatures in the 80s, which helped dry the greens. She hit her pitch shot within 5 feet on the par-5, 525-yard final hole. 

Michelle Wie, bothered by ankle and hip injuries, birdied the 18th for a 72 to make the cut on the number.

Koepka leads halfway

MEMPHIS, Tenn. >> Brooks Koepka, who had a share of the lead after the first round, shot a 3-under 67 Friday to lead the St. Jude Classic by a stroke after 36 holes. 

He turned in a four birdie-one bogey round for a 9-under 131.

Fellow American Austin Cook (64) was at 132.

Langer shoots another 65

BELMONT, Mass. >> Bernhard Langer shot his second consecutive 6-under-par 65 to extend his lead to four shots halfway through the Senior Players Championship.

Langer sank a 40-foot birdie putt on 16 in a round in which he hit 17 greens in regulation at Belmont Country Club.