Sung Hyun Park went out Saturday and shot 67 to put herself in contention to win the Women's U.S. Open. Then she went out Sunday and did the exact same thing to actually win the tournament.
Park fired off her second consecutive five-under round to finish at 11 under for the event and earn a two-stroke win over Hye-jin Choi, the amateur who entered the day with a share of the lead. Choi fell out of contention with a rough double bogey on No. 16.
Shanshan Feng, who shared the lead with Choi coming into the round, was in second place until triple-bogeying No. 18. She finished in a tie for fifth at six under.
"I did pretty well until the last hole," Feng said, per Ron Sirak of the LPGA's official website. "Overall, I think I had a great week. Coming into this week I had no expectation at all."
M.J. Mur and So Yeon Ryu tied for third at seven under, while Carlota Ciganda and Feng rounded out the top five.
Park, a rookie on the LPGA Tour, entered the weekend at just one under after shooting 73 and 70 on Thursday and Friday. But something clicked over the last two days, as Park carded 12 birdies against just two bogeys over her final 36 holes to ascend to the championship.
"I did not have the best first and second rounds," Park said through a translator, per Sirak. "I wanted to believe in myself again for the final two rounds and I did."
She is a clear leader for Rookie of the Year honors, and Sirak notes she could become the first woman since 1978 to win Player of the Year and Rookie of the Year.
Park's only blemish of Sunday came on the par-four ninth, but otherwise she was flawless. She got to three under for the day after birdies on Nos. 2, 5 and 8, then added three more on Nos. 12, 15 and 17.
Choi was attempting to become just the second amateur in history to win a U.S. Women's Open. Catherine Lacoste took home the U.S. Open in 1967.
No American finished inside the top 10. Marina Alex was the top player from the United States at four under in a tie for 11th.
2017 Women's U.S. Open Results
T-3. M.J. Mur (-7)
T-3. So-Yeon Ryu (-7)
T-5. Shanshan Feng (-6)