Out with the young, and in with the younger.

There will be a first-time winner at the 105th Manoa Cup, guaranteed now thanks to defending champion Matthew Ma’s ouster and a narrow defeat for four-time winner Brandan Kop in Wednesday’s round of 32.

Teenagers have all but wiped out the rest of the field after two rounds of head-to-head action on the taxing slopes of Oahu Country Club.

This edition of the state’s signature amateur match-play tournament was light on former champs, and the only two past winners couldn’t stack up to younger challengers Wednesday.

"You got a lot of the young players," Kop said after his 2 and 1 loss to Bradley Shigezawa, studying the survivors on the large bracket board at the clubhouse.

"You got a junior golf tournament over here," added Kop, laughing. "They got a better feel because they play every day, or us guys gotta work."

The 28-year-old Ma was routed 6 and 4 by Moanalua High’s Kyosuke Hara, and the veteran Kop lost a late lead, then the match to Shigezawa, the reigning NCAA Division III champion at Claremont-Mudd-Scripps.

Hara carded six birdies in 14 holes, but even his pars were good enough on a day where Ma didn’t have his best stuff.

"I’d be more disappointed if I played well and lost that way in a tight match," said Ma, who needed a 19-hole playoff to survive the first round Tuesday. "I just ran into someone who was playing hot today. He had a hot hand and I was just behind. He just beat me like a drum."

Roughly half the original field of 64 was under 20 years old, and much of that youth movement is still alive and well. The only remaining old-timers are Doug Williams (55) and Nick Ushijima (48).

As ludicrous as it sounds, Shigezawa, 21, is practically an old man now by Manoa Cup standards; he first qualified for the event at age 12. He took holes 12, 14, 15 and 16 from Kop to go from 2 down to 2 up and earn a playdate with Cory Oride today.

"Once I found out I had to play Brandan, you know that he’s not going to hand you anything," Shigezawa said. "I knew I needed to put a good back nine to even have a chance."

Kop rued a missed 21⁄2 -footer on No. 11 that would have put him 3 up, and Shigezawa stuck his shots late.

"What it came down to, the mind wasn’t strong enough on the back nine," Kop said. "(I’ll) try again."

High school boys state champion Kalena Preus of Punahou posted his second straight dominant victory on his home course, a 5 and 3 effort over Loi Chang-Stroman.

"We’re rolling the ball really well, so we’re putting ourselves in good positions for being offensive, and making the other player feel uncomfortable," the University of Texas-bound Preus said of his father’s caddying advice. "I think if we stick to our guns, we’re going to be OK."

Monique Ishikawa’s bid to join Alina Ching (2010) as the furthest advancing female in the event’s history was denied on a 30-foot playoff putt by Donny Hopoi.

It was an impressive show of mental fortitude by Hopoi, a 16-year-old at Kamehameha. He had a chip shot on 18 get within a few feet of the cup — then get blown clear off the green by a devastating Nuuanu gust before he could mark his ball.

Ishikawa, a Kalaheo product who just completed her freshman year at Columbia, was riding some momentum at that point, having rallied from 2 down through 15.

"That was crazy," Hopoi said. "Even that (playoff) hole, it was so nerve-wracking. So much fun."

He got to line up his winning uphill putt after watching Ishikawa miss just wide from slightly more distance.

"Monique played great today. If we played again, the outcome could have been much different," Hopoi said.

The youngest player in the full field, 13-year-old Evan Kawai, was ousted 5 and 4 by Ryan Kalani Lloyd.

Other winners Wednesday were Shawn Lu, Jared Sawada, Kyle Suppa, Brent Grant, Todd Rego, Sj Maeng, Andy Okita and Richard Hattori.

Hara takes on Lloyd at 7 this morning to open the round of 16.