A disappointing third-round 73 saw Leona Maguire slip down the leaderboard at the Queen City Championship in Cincinnati, 10 shots adrift of leader Ally Ewing.

A second-round 67 had left the Cavan woman just half a dozen shots off the top of the standings, but she couldn't replicate that form with a one-over-par round leaving her in a tie for 18th on six-under.

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Stephanie Meadow, who made the cut by two shots, is a further shot back after her best round of the tournament. A 71 moved her to five-under-par.

American Ewing is the woman to catch however.

Ewing sits at 16-under 200 for the tournament, one shot ahead of Italy's Maria Fassi, who matched Ewing's 67 at Kenwood Country Club.

China's Xiyu Lin (70) is alone in third place at 14 under, two shots back. Four players are tied for fourth at 12 under, four shots behind Ewing.

Ewing birdied three of her first four holes and finished with six for the round. Her only blemish was a bogey on the par-4 18th hole.

"It was exciting to get out to a good start," Ewing said. "My mindset going into today was to play within myself and go out, execute shots, and I did that really well. Unfortunate bogey on 18. It's a tough hole and didn't get a ball up and down. Really happy with how I played and how I handled myself, and obviously in a good position for tomorrow."

Ewing is looking for her third career LPGA Tour title.

"I've had my ups and downs this year just kind of mentally trying to gain that confidence back in every aspect, whether it's playing solid, putting a score together, rolling in putts," she said.