Lexi Thompson won her final-round duel with joint overnight leader Lydia Ko, charging clear with the stronger finish to beat the former World No. 1 by all of four shots at the Indy Women in Tech Championship on Saturday.
In the week before the final major of the year, the Evian Championship in France, the 22-year-old US No 1 seemed to have found her A game at just the right time.
She opened with a stunning 63, added a 66 in the Second of this three round event and then closed an excellent week with a 4-under 68 at the Brickyard Crossing Golf Course to finish going away from the field at 19-under.
"It's certainly a big confidence booster going into the last Major of the year," said Thompson, who is expected to move up into the No 2 slot on the Women's World Ranking list ahead of the Evian.
"I knew my game was in a good spot. I really committed to my shots this week and had some fun."
In the meantime, Ko, who slipped back from Thompson with a double bogey at the par 4 11th hole and never recovered, carded a 72 to finish as the sole runner-up, one stroke in front of Australia's Minjee Lee (67).
Thompson had a clear four stroke lead when her drive found water at the 16th but she never allowed the resultant bogey to unsettled her and she went on to get the shot back with a birdie at the par-four 18th hole and triumph for the 9th time on the LPGA Tour.
Ko came back from the doldrums to snatch her first top-10 finish since mid-June but struggled on the greens in the final round on Saturday.
"I just wasn't putting as well as I did in the last few days, and that makes a huge difference," she said. "When you're in the final round and final group, you kind of want those putts to drop and unfortunately that wasn't happening for me."
Rookie Olafia Kristinsdottir, Iceland's first LPGA Tour player, finished in an honourable 4th place, putting the icing on her cake with an eagle at the 18th hole in her final round. She carded a 68 for a 203 total.
LEADING FINAL SCORES
197 Lexi Thompson (USA) 63 66 68
201 Lydia Ko (NZL) 65 64 72
202 Min Jee Lee (AUS) 69 66 67
203 Olafia Kristinsdottir (ISL) 67 68 68
204 Kang Hae Ji (KOR) 68 68 68, Lizette Salas (USA) 70 65 69, Brooke Henderson (CAN) 67 68 69, Ashleigh Buhai (RSA) 67 66 71, Candie Kung (TPE) 66 64 74
205 Moriya Jutanugarn (THA) 65 70 70
206 Austin Ernst (USA) 71 67 68, Cristie Kerr (USA) 67 67 72
207 Caroline Masson (GER) 70 68 69, Marina Alex (USA) 67 70 70
208 Azahara Munoz (ESP) 69 70 69, Cheyenne Woods (USA) 69 70 69, Ally McDonald (USA) 70 67 71, Kim Kaufman (USA) 68 69 71.
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