Oh, Nelly! Korda flirts with 59 to build 4-shot Olympic lead

Nelly Korda, of the United States, sets her sunglasses on the 17th hole during the second round of the women's golf event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, at the Kasumigaseki Country Club in Kawagoe, Japan. (AP Photo/Andy Wong)

Nelly Korda, of the United States, gestures after making a birdie putt on the 16th green during the second round of the women's golf event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, at the Kasumigaseki Country Club in Kawagoe, Japan. (AP Photo/Andy Wong)

Nanna Koerstz Madsen, of Denmark, watches her tee shot on the 10th hole during the second round of the women's golf event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, at the Kasumigaseki Country Club in Kawagoe, Japan. (AP Photo/Matt York)

Aditi Ashok, of India, walks on the 13th hole during the second round of the women's golf event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, at the Kasumigaseki Country Club in Kawagoe, Japan. (AP Photo/Matt York)

Nelly Korda, of the United States, plays a shot from a bunker on the 18th hole during the second round of the women's golf event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, at the Kasumigaseki Country Club in Kawagoe, Japan. (AP Photo/Andy Wong)

Nelly Korda, of the United States, lines up a putt on the 14th hole during the second round of the women's golf event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, at the Kasumigaseki Country Club in Kawagoe, Japan. (AP Photo/Andy Wong)

Nelly Korda, of the United States, refreshes on 14th hole during the second round of the women's golf event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, at the Kasumigaseki Country Club in Kawagoe, Japan. (AP Photo/Matt York)

Emily Pedersen, of Denmark, plays a shot from a bunker on the 12th hole during the second round of the women's golf event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, at the Kasumigaseki Country Club in Kawagoe, Japan. (AP Photo/Andy Wong)

Aditi Ashok, of India, chips onto the second green during the second round of the women's golf event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, at the Kasumigaseki Country Club in Kawagoe, Japan. (AP Photo/Andy Wong)

Nelly Korda, of the United States, hits a tee shot on the 14th hole during the second round of the women's golf event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, at the Kasumigaseki Country Club in Kawagoe, Japan. (AP Photo/Matt York)

Emily Pedersen, of Denmark, plays a shot from the 15th fairway during the second round of the women's golf event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, at the Kasumigaseki Country Club in Kawagoe, Japan. (AP Photo/Matt York)

Nelly Korda, of the United States, celebrates after a birdie with her caddie on the 16th hole during the second round of the women's golf event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, at the Kasumigaseki Country Club in Kawagoe, Japan. (AP Photo/Andy Wong)

Nanna Koerstz Madsen, of Denmark, studies her shot from a bunker on the 9th green during the second round of the women's golf event at the 2020 Summer Olympics, Thursday, Aug. 5, 2021, at the Kasumigaseki Country Club in Kawagoe, Japan. (AP Photo/Andy Wong)