On what proved to be a tougher day at Garden City’s Buffalo Dunes Golf Course, Jeremy Yun, of Menlo Park, Calif., posted the only under-par score of the day Wednesday to take a two-stroke lead into Thursday’s final round.

Yun was tied with three other golfers after Tuesday’s opening round at 4-under, but while all of the other co-leaders regressed by at least seven shots on Wednesday, Yun continued to motor along with a 1-under 71 to sit 5-under.

Luke Morgan (Guthrie, Okla.) and Ryan Sangchompuphen (Denver) are two strokes back after identical 69-72 rounds.

On the girls side, Yoonjeong Huh lengthened her lead with an even-par 72 on Wednesday, and now sits at minus-2 and leads by three strokes over a pair of golfers.

However, none of the three Garden City golfers (two boys, one girl) nor Stanton County’s Rylie Cook was able to make the cut, and all four won't play in Thursday’s final round.

Cook was a stroke off, posting rounds of 77 and 78 to finish 11-over — the cut line was 10-over. Garden City’s Alyssa McMillen finished her tournament at 29-over (90-83).

On the boys side, Theo Juhl was nearly in line to make the cut after Tuesday’s round, but posted a 93 on Wednesday and finished 27-over, well behind the cut line of 7-over.

Jarrett Richmeier also missed the cut at 33-over (87-90).

Yun kept his lead by playing mostly mistake free on Wednesday, only bogeying the par-5 14th, but more than made up for that with birdies at both the par-4s 2nd and 11th.

Meanwhile, Moran and Sangchompuphen jumped the other co-leaders from Tuesday by posting even-par 72s Wednesday. Both were up and down, with Morgan posting three birdies and three bogeys, and Sanchompuphen carded a double bogey and two bogeys, but made up for it with four birdies. He had a hole-in-one on the 17th on Tuesday.

Of the other co-leaders after the first round, Cole Wilczek and Josiah Crews had the best days Wednesday, carding 75s to sit at 1-under. But that leaves both of them four shots back of Yun. Charlie Jackson carded a 76 Wednesday and is five shots back. Ryan Nelson and Brooks Li had the low rounds on Wednesday, carding 2-under 70s. Nelson is tied for 11th and is five back of Yun, and Li rebounded from his 77 on Tuesday to now sit 3-over and in a tied for 22nd entering Thursday.

On the girls side, Huh bogeyed both the par-4 18th and 6th, as well as the par-3 14th. She made up for it, however, with birdies at the par-4s first and 15th and the par-5 10th.

Borina Sutikto and Tianyi Zhuang are tied for second and are three shots back of Huh. The rest of the field is another three shots off the pace, with a group of four golfers tied for fourth at 4-over.