Japan’s Mamiko Higa shot a bogey-free 65 for the lowest round ever in a U.S. Women’s Open debut, taking an early lead at the event.

Higa had three straight birdies on the front nine for a one-shot lead halfway through the opening round at the Country Club of Charleston. Her sixth and final birdie came at the par-3 17th.

Esther Henseleit of Germany had a 66 and Celine Boutier of France was next at 67. Sei Young Kim of South Korea finished at 68.

Mamiko Higa of Japan, 12th tee during the first round of the U.S. Women's Open golf tournament, Thursday, May 30, 2019, in Charleston, S.C. (AP Photo/Mic Smith)
Mamiko Higa of Japan, 12th tee during the first round of the U.S. Women’s Open golf tournament, Thursday, May 30, 2019, in Charleston, S.C. (AP Photo/Mic Smith)

The 25-year-old Higa tied for the third-lowest round in U.S. Women’s Open history. Helen Alfredsson holds the record with a 63 in her opening round in 1994.

The other half of the field teed off in a steamy afternoon where temperatures rose to the mid-90s.

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Minjee Lee of Australia, watches her putt on the 10th green during the first round of the U.S. Women's Open golf tournament, Thursday, May 30, 2019, in Charleston. (AP Photo/Steve Helber)
Minjee Lee of Australia, watches her putt on the 10th green during the first round of the U.S. Women’s Open golf tournament, Thursday, May 30, 2019, in Charleston. (AP Photo/Steve Helber)
Jinyoung Ko of South Korea, watches her shot off the first tee during the first round of the U.S. Women's Open golf tournament, Thursday, May 30, 2019, in Charleston. (AP Photo/Steve Helber)
Jinyoung Ko of South Korea, watches her shot off the first tee during the first round of the U.S. Women’s Open golf tournament, Thursday, May 30, 2019, in Charleston. (AP Photo/Steve Helber)
Inbee Park of South Korea, watches her shot off the first tee during the first round of the U.S. Women's Open golf tournament, Thursday, May 30, 2019, in Charleston. (AP Photo/Steve Helber)
Inbee Park of South Korea, watches her shot off the first tee during the first round of the U.S. Women’s Open golf tournament, Thursday, May 30, 2019, in Charleston. (AP Photo/Steve Helber)
Esther Henseleit of Germany, reacts to missing a birdie on the 18th green during the first round of the U.S. Women's Open golf tournament, Thursday, May 30, 2019, in Charleston, S.C. (AP Photo/Steve Helber)
Esther Henseleit of Germany, reacts to missing a birdie on the 18th green during the first round of the U.S. Women’s Open golf tournament, Thursday, May 30, 2019, in Charleston, S.C. (AP Photo/Steve Helber)
Jimin Kang watches a drive on the range ahead of the first round of the U.S. Women's Open golf tournament, Thursday, May 30, 2019, in Charleston. (AP Photo/Mic Smith)
Jimin Kang watches a drive on the range ahead of the first round of the U.S. Women’s Open golf tournament, Thursday, May 30, 2019, in Charleston. (AP Photo/Mic Smith)
Mamiko Higa of Japan, watches play on the nine hole during the first round of the U.S. Women's Open golf tournament, Thursday, May 30, 2019, in Charleston, S.C. (AP Photo/Mic Smith)
Mamiko Higa of Japan, watches play on the nine hole during the first round of the U.S. Women’s Open golf tournament, Thursday, May 30, 2019, in Charleston, S.C. (AP Photo/Mic Smith)
Mamiko Higa of Japan, views her yardage book as her caddie Ei Kawato holds an umbrella during the first round of the U.S. Women's Open golf tournament, Thursday, May 30, 2019, in Charleston, S.C. (AP Photo/Mic Smith)
Mamiko Higa of Japan, views her yardage book as her caddie Ei Kawato holds an umbrella during the first round of the U.S. Women’s Open golf tournament, Thursday, May 30, 2019, in Charleston, S.C. (AP Photo/Mic Smith)