Taking the spoils this time was Park Sung-hyun.
With AP Photos.Sung Hyun Park erased a two-shot deficit over the final four holes and birdied the first hole of a playoff with Lizette Salas to win the Indy Women in Tech Championship.
The South Korean's third victory of the season sees her vault from fourth in the rankings to supplant Thailand's Ariya Jutanugarn at the top. She took the lead with a birdie on the par-4, 16th - after Park hit her approach into the water en route to a double bogey.
South Korea's Amy Yang was third, a shot back at 22-under-par after a 69.
"I have been just striking the ball really well this entire year, and just glad some more putts dropped today", she said.
"I'm very honoured to be ranked No. 1 and I hope to maintain that ranking for a long time", she said through an interpreter.
She spent one week at the top in November last year, a historic season in which she won both the Rookie of the Year and the money title and shared the Player of the Year award with fellow South Korean Ryu So-yeon.
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Salas climbed to as high as No. 10 in the world following her victory at the 2014 Kingsmill Championship.
But the 29-year-old Californian seems to have the ideal touch for this course, which weaves around and inside the historic Indianapolis Motor Speedway. "This was a completely different golf course, so I had to change my mentality a little bit and I had to forget about the 62 in a way and just go back to what I was doing".
Once the second round is complete, the 36-hole cut will be made.
Defending champion Lexi Thompson opened last year's inaugural tournament with a 63, one shot off of Mike McCullough's 62 in the PGA Champions Tour's 1999 Comfort Classic. If the forecast for mostly sunny conditions Sunday holds, the soft greens that have kept scores at near record-lows through the first three rounds could suddenly become quicker and less forgiving. She drained a 15-footer to end Salas's quest to quench a four-year drought.
"And it's just about the weather now, so hopefully, the weather's good".
"I'm going to do really well", she said.