Defending champion David Fink ousted the coolest — and oldest — guy remaining and 15-year-old John Oda took out the hottest in Friday’s semifinals. This morning, they meet at Oahu Country Club for the 103rd Manoa Cup.

Oda defeated medalist and Moanalua High School teammate Seungjae Maeng, 4 and 3. Fink ran his winning streak in this event to 11 with a 1-up win over Nick Ushijima, a businessman from California who now plays at Olympic Club after living in Japan the past eight years.

At 46, Ushijima is 26 years older than Fink, a 2009 ‘Iolani graduate who attends Oregon State. After walking 17 holes to beat Kyle Hayashi in a morning quarterfinal, the “old guy” was 3 down to Fink, who played the first six holes in 3 under par.

Ushijima birdied the par-3 seventh, came within a foot of acing the par-4 10th and out-finessed Fink — an OCC member — for a one-putt par on the 12th to tie it. Fink hit the flag with his second shot and the ball rolled off the green and down the hill.

“He’s a great player,” Fink said. “He was down early and he never backed off. … I love that. I love that he was a great competitor and pushed me to the last putt.”

Ushijima calmly took his first lead on the next hole, after Fink’s ball got caught on a root. The defending champ, intent on not letting those two bad breaks be the reason he lost, fought back.

Fink fired birdies at the 14th and 16th to go 1 up. Ushijima, who hits the ball spectacularly straight and appeared unfazed by OCC’s idiosyncracies in his first week on Hawaii’s most offbeat course, almost chipped in to win the 17th. They went to the final hole tied.

Then, with Fink 2 feet from par, Ushijima went “all in” on a 25-foot birdie putt to win. He knocked it 8 feet by and could not make par coming back, giving Fink an opportunity to successfully defend a Manoa Cup for the first time in 13 years.

“I wanted to make that one,” said Ushijima, whose caddie most of the week was Hawaii pro John Hearn, a former University of the Pacific teammate. “Obviously I hit it way too hard.”

A year ago Fink fired a 65 in the qualifying round and never cooled off. This year he was 4 down with six to go in the first round and has been grinding ever since.

“Ken (Miyaoka), the guy they have dedicated this week to, was all about grinding,” Fink said. “People called him a grinder and that’s what it’s been about so far. You’ve really got to dig deep. Things are thrown at you from all different angles. You’ve got to take it in and just say: ‘That’s golf.’”

Oda eliminated his hairdresser in the other semifinal. Maeng, who gave himself blond locks a few months ago, colored Oda’s hair at the state championship last month. Friday, his younger teammate claimed Maeng’s unofficial title as the Cup’s hottest player after starting the day with a 6-and-5 quarterfinal win over Kalena Preus.

It was the end of a brilliant week, and very weird day, for Maeng. He was all but flawless for four days, then was within 2 feet of losing to Skye Inakoshi — another 15-year-old — on the 18th green of their morning match. All Inakoshi had to do was finish off his par for the win, but after he marked his ball next to the hole, and before he picked it up, a huge gust of wind teamed with OCC’s slick greens to knock it almost back to where he started.

Inakoshi asked for a ruling. After officials checked the rule book, his ball stayed where it had blown. Maeng won the hole with par to send it to overtime.

Both bogeyed the first hole, Maeng three-putting after Inakoshi drove into a hazard, before Maeng birdied the second to end it after 20 holes.

It was the last meaningful putt he would make. Oda won four holes with par on the front nine against Maeng. The only hole he lost came on just his second bogey of the day. He has tamed OCC’s craziness with great consistency to the green and a brilliant touch on it.

Not bad for his first try.

“I am just really excited for tomorrow,” Oda said, “to reach the final in my first Manoa Cup.”

In other quarterfinals, Fink defeated Donny Hopoi, 1 up, and Ushijima beat Kyle Hayashi, 3 and 1.