SYLVANIA, Ohio — For only the second time in her seven-year career, Thidapa Suwannapura took the overnight lead at an LPGA Tour event.

Suwannapura shot a 6-under-par 65 on Thursday at the Marathon Classic and led seven players by one shot. The Thai player grabbed the outright lead with a birdie on the par-5 18th at Highland Meadows — her 10th birdie of the day.

"I'm really happy about the way I played today," she said. "I didn't really look at the leaderboard, and did not even expect anything. I have a chance, so let's see how it goes."

Suwannapura, who has three top-10 finishes in 120 career LPGA Tour starts, last had the overnight lead after the first round of the 2013 Pure Silk-Bahamas LPGA Classic, where she faded in the second round and finished in a tie for 65th.

The 25-year-old Suwannapura's best career finish was seventh at the 2014 Kingsmill Invitational. That was also her last top 10. This season, her best performance was a tie for 18th three weeks ago in Arkansas.

Seven players, including defending champion I.K. Kim and former No. 1 Yani Tseng, were a stroke behind at 66.

Kim, who started her round on the back nine, said conditions were calmer once she made the turn. She birdied five of the final six holes, including the par-4 ninth.

"Not much wind out there. So I took that advantage on the front nine," she said. "I had a good roll, all three birdies in a row. And birdieing the last two par-5's was really fun."

Tseng was the only player in the top eight to have a bogey-free round. She missed an eagle putt on the final hole that would have drawn her even with Suwannapura.

"I stayed patient all day. Just need to get that putting going a little bit," Tseng said. "So today I dropped a few, I missed a few, and this is how golf is. I feel like this is the way I should play."

Thursday

At Highland Meadows Golf Club, Sylvania, Ohio

Purse: $1.6 million

Yardage: 6,541; Par: 71 (34-37)

First Round

(a-amateur)

Thidapa Suwannapura 33-32—65 -6

Caroline Hedwall 33-33—66 -5

In Gee Chun 32-34—66 -5

Mirim Lee 32-34—66 -5

In-Kyung Kim 34-32—66 -5

Yani Tseng 33-33—66 -5

Jacqui Concolino 33-33—66 -5

Katelyn Dambaugh 32-34—66 -5

Allison Emrey 31-36—67 -4

Christina Kim 33-34—67 -4

Brooke M. Henderson 33-34—67 -4

Annie Park 32-35—67 -4

Caroline Inglis 31-36—67 -4

Kris Tamulis 33-34—67 -4

Wichanee Meechai 34-33—67 -4

Xiyu Lin 33-34—67 -4

Sandra Changkija 34-34—68 -3

Wei-Ling Hsu 36-32—68 -3

Emma Talley 35-33—68 -3

Brittany Lincicome 32-36—68 -3

a-Jennifer Kupcho 31-37—68 -3

Cindy LaCrosse 33-35—68 -3

Mina Harigae 33-35—68 -3

Emily Pedersen 36-32—68 -3

Nanna Koerstz Madsen 32-36—68 -3

Austin Ernst 35-33—68 -3

Stacy Lewis 32-36—68 -3

Chella Choi 34-34—68 -3

Marina Alex 34-34—68 -3

Katherine Perry 33-35—68 -3

Sei Young Kim 32-37—69 -2

Mo Martin 33-36—69 -2

Hyo Joo Kim 34-35—69 -2

Simin Feng 35-34—69 -2

Emily Tubert 35-34—69 -2

Erynne Lee 32-37—69 -2

Celine Herbin 33-36—69 -2

Brianna Do 34-35—69 -2

Cydney Clanton 33-36—69 -2

Beatriz Recari 35-34—69 -2

Peiyun Chien 33-36—69 -2

Harang Lee 33-36—69 -2

Brittany Benvenuto 34-36—70 -1

Olafia Kristinsdottir 33-37—70 -1

Camilla Lennarth 35-35—70 -1

Jennifer Song 34-36—70 -1

Lee-Anne Pace 35-35—70 -1

Lexi Thompson 36-34—70 -1

Jessy Tang 34-36—70 -1

Cheyenne Woods 33-37—70 -1

Tiffany Chan 34-36—70 -1

Mind Muangkhumsakul 35-35—70 -1

Tiffany Joh 32-38—70 -1

Brittany Marchand 34-36—70 -1

Ally McDonald 35-35—70 -1

Jaye Marie Green 32-38—70 -1

Mel Reid 35-35—70 -1

Luna Sobron 33-38—71 E

Laetitia Beck 34-37—71 E

Jackie Stoelting 33-38—71 E

Becky Morgan 35-36—71 E

Katie Burnett 34-37—71 E

Sarah Kemp 35-36—71 E

Angel Yin 34-37—71 E

Paula Creamer 35-36—71 E

Yu Liu 35-36—71 E

Haru Nomura 34-37—71 E

Morgan Pressel 34-37—71 E

a-Bianca Pagdanganan 32-39—71 E

Martina Edberg 34-37—71 E

Julieta Granada 34-37—71 E

Holly Clyburn 36-35—71 E

Sophia Popov 36-35—71 E

Alena Sharp 35-36—71 E

AJ Newell 33-39—72 +1

Robynn Ree 34-38—72 +1

Kelly Shon 35-37—72 +1

Samantha Troyanovich 37-35—72 +1

Pornanong Phatlum 37-35—72 +1

Sherman Santiwiwatthanaphong 35-37—72 +1

Celine Boutier 32-40—72 +1

Haeji Kang 36-36—72 +1

Giulia Molinaro 34-38—72 +1

Dori Carter 35-37—72 +1

Amelia Lewis 35-37—72 +1

Maude-Aimee Leblanc 36-36—72 +1

Beth Allen 36-36—72 +1

Lee Lopez 33-39—72 +1

Maria Torres 35-37—72 +1

Min Lee 35-37—72 +1

Benyapa Niphatsophon 36-36—72 +1

P.K. Kongkraphan 34-38—72 +1

Jimin Kang 35-37—72 +1

Sydnee Michaels 35-38—73 +2

Molly Skapik 36-37—73 +2

Alison Lee 36-37—73 +2

Sakura Yokomine 36-37—73 +2

Charley Hull 36-37—73 +2

Angela Stanford 34-39—73 +2

Mariajo Uribe 35-38—73 +2

Madeleine Sheils 36-37—73 +2

Candie Kung 36-37—73 +2

Maddie McCrary 35-38—73 +2

Brittany Lang 35-38—73 +2

Kristy McPherson 35-38—73 +2

Mika Miyazato 36-37—73 +2

Allie White 33-40—73 +2

Laura Diaz 35-38—73 +2

Jillian Hollis 33-40—73 +2

Rebecca Artis 34-39—73 +2

Pannarat Thanapolboonyaras 36-38—74 +3

Maria Hernandez 37-37—74 +3

Dani Holmqvist 33-41—74 +3

Kassidy Teare 36-38—74 +3

Kim Williams 33-41—74 +3

Danah Bordner 33-41—74 +3

Lizzie Win 36-39—75 +4

Daniela Darquea 38-37—75 +4

Mariah Stackhouse 36-39—75 +4

Paula Reto 39-36—75 +4

Kendall Dye 36-39—75 +4

Aditi Ashok 38-37—75 +4

Leticia Ras-Anderica 37-38—75 +4

Daniela Iacobelli 37-39—76 +5

Gaby Lopez 39-37—76 +5

Ayako Uehara 38-38—76 +5

Lauren Kim 40-36—76 +5

Silvia Cavalleri 38-38—76 +5

Alison Walshe 37-39—76 +5

Perrine Delacour 35-42—77 +6

Kim Kaufman 36-41—77 +6

Katelyn Sepmoree 40-37—77 +6

Ashli Bunch 39-38—77 +6

Jing Yan 37-40—77 +6

Lauren Coughlin 38-40—78 +7

Rachel Rohanna 39-40—79 +8

Jennifer Hahn 36-43—79 +8

a-Pinya Pipatjarasgit 41-39—80 +9

Nannette Hill 40-40—80 +9

Nicole Jeray 40-45—85 +14

Ilhee Lee WD