In Gee Chun shot a 6-under 66 on Thursday in the Cambia Portland Classic in Oregon to take a one-stroke lead over two-time defending champion Brooke Henderson and five others.

Playing the event for the first time, the sixth-ranked Chun had seven birdies and a bogey at tree-lined Columbia Edgewater.

“Before coming here everyone said the course is really good,” Chun said. “I agreed. I like big trees. It’s amazing. And the greens are very consistent and really good condition.”

The South Korean player tied for third last week in the Canadian Pacific Women’s Open and has four runner-up finishes this season. Both of her LPGA Tour victories have come in majors — the 2015 U.S. Women’s Open and the 2016 Evian Championship.

Henderson had six birdies and a bogey to match Cheyenne Woods, Cindy LaCrosse, Moriya Jutanugarn, Nicole Broch Larsen and Nasa Hataoka at 67.

Lexi Thompson had an eagle and a double bogey in a 68.

Also making her first start in the event, the second-ranked Thompson eagled the par-5 fifth to reach 4 under and was 5 under after a birdie on the par-4 11th, but dropped back with the double bogey after driving to right on the par-4 17th. She rebounded with a long birdie putt from the fringe on the par-4 18th.

European Tour

Callum Shinkwin shot an opening 6-under 66 to take the lead at the Czech Masters.

After finishing second last month at the Scottish Open — his best result on the European Tour so far — the 24-year-old Englishman opened with a birdie at the Albatross Golf Resort near Prague.

Enjoying sunny conditions early in the day that changed to rain later, Shinkwin dropped 1 shot at the third hole and another on No. 14 but also added seven more birdies for a 1-stroke lead.

Pontus Widegren of Sweden, South African Dylan Frittelli and another Englishman James Heath are all tied in second after carding 67. A group of eight, including American Julian Suri, who won the Made in Denmark event on Sunday, is 1 stroke behind them.

Web.com Tour

Keith Mitchell took the lead in the Web.com Tour Finals-opening Nationwide Children’s Hospital Championship in Columbus, four days after missing a PGA Tour card by a stroke in the Web.com Tour’s regular-season finale.

Mitchell had a 6-under 65 on Ohio State’s Scarlet Course for a 1-stroke lead over Abraham Ancer of Mexico. Sam Saunders, Arnold Palmer’s grandson, was another stroke back with Alex Cejka.

The four-event series features the top 75 players from the Web.com regular-season money list, Nos. 126-200 in the PGA Tour’s FedEx Cup standings and non-members with enough PGA Tour money to have placed in the top 200 in the FedEx Cup had they been eligible.

Hunter Mahan birdied the final two holes for a 68. The six-time PGA Tour winner was 182nd in the FedEx Cup standings. Five-time PGA Tour winner Ben Crane had a 69, and nine-time PGA Tour winner Stuart Appleby shot 75.