SOUTHAMPTON, N.Y. (AP) — South Korea’s Ha-Neul Kim upstaged friend Inbee Park to take the first-round lead at her first U.S. Women’s Open.

Kim shot a bogey-free 6- under 66 on Thursday at Sebonack to lead Park by a stroke. The top-ranked Park is trying to make history by winning the first three majors of the year.

Currently a member of the KLPGA Tour, Kim is a seventime winner in South Korea. She kept giving herself short birdie putts and making them.

AT&T NATIONAL

BETHESDA, Md. (AP) — Roberto Castro took the firstround lead in the AT&T National at Congressional, shooting a 5-under 66 on the difficult course that has hosted three U.S. Opens.

Winless on the PGA Tour, Castro made three straight birdies late in his round with a 20-foot putt, a perfect 3-wood into a par 5 and a chip-in.

Only a dozen players shot in the 60s and the average score was just over 73, despite cloud cover for most of the day leading to soft conditions and only a light wind.

SENIOR PLAYERS

PITTSBURGH (AP) — John Huston shot a 5-under 65 to take the first-round lead in the Senior Players Championship, the third of the Champions Tour’s five majors.

Huston started on No. 10 and was even par halfway through his round before making a big move on the front nine at soggy Fox Chapel. Huston shot 5-under 30 coming in, including four birdies and an eagle on the short par-4 seventh. The 52- year-old Huston missed three months this season because of lower back problems.

IRISH OPEN

MAYNOOTH, Ireland (AP) — Saying he’s “feeling a bit lost” in a difficult year, Rory McIlroy shot a 2-over 74 in the Irish Open to fall eight strokes behind first-round leader Oscar Floren.

The second-ranked McIlroy, from Northern Ireland, had four bogeys and two birdies in wet and overcast conditions at Carton House. Floren, from Sweden, had a 6- under 66.