Two 15-year-olds will represent Hawaii at the U.S. Amateur after winning the local sectional Monday at the Hawaii Prince course.

State high school champion Rudy Cabalar Jr., a Campbell High junior who turns 16 on Saturday, earned medalist honors among 31 players. He opened with a 4-under-par 68 in windy conditions and shot 76 in the afternoon for an even-par 144 total.

Kalena Preus, a Punahou sophomore, was a shot back after rounds of 71-74.

Hawaii’s alternates are Punahou graduate Bradley Shigezawa (72-74–146) and Seabury Hall junior Alex Chiarella (70-77–147).

The U.S. Amateur Championship is Aug. 23-29 at University Place, Wash.

On the mainland:

» Yesterday’s second round of the 35th Junior PGA Championship was washed out in Fort Wayne, Ind.

In Monday’s opening round, state high school champion Cassy Isagawa fired an even-par 72. The Baldwin High senior is tied for fifth, two shots out of first.

Punahou senior Cyd Okino, who played with Isagawa on Hawaii’s winning Girls Junior America’s Cup team last week, has a share of 17th after a 76. In the Boys division, Haiku’s Justin Keiley opened with a 6-over 78 and is tied for 53rd.

The tournament will now be 54 holes. There is a cut today to the low 35 boys and girls, including ties. The champion and runner-up earn berths on the 2010 U.S. Junior Ryder Cup Team.

» At the Adams Junior Tour Championship in East Lansing, Mich., Kihei’s Andre Bedard is tied for eighth in the Boys 15-19 division after a 74. Wailuku’s Dan Kendrick-Dumo shot 78 (18th). Kailua’s Mark Uekawa shot 83 (16th) in the Boys 13-14s.

» Moanalua High sophomore Eimi Koga tied for third last weekend in the Girls 14s at the U.S. Kids Golf Teen World Championship, in Pinehurst, N.C. Koga shot rounds of 73-75-76. Her 224 total was eight shots back of champion Yasemin Sari, from Germany.

Jino Sohn, from Honolulu, tied for 34th in the Boys 13s, at 74–226. In the Boys 14s, Colby Takushi of Pearl City shot 76–240 (49th).

» At the Optimist International Junior Golf Championships in Florida, Mililani’s Kristen Sawada (79–323) tied for 30th in Girls 16-18s. Monica Keo of Kaneohe tied for 35th at 86–329.

Tyler Ota led the Hawaii boys, getting a share of 32nd with a score of 79–302. Waipahu’s Thayer Schmitz and Honolulu’s Quinten Nishime missed the cut.

» Punahou graduate Alex Ching finished 53rd in the 52nd annual Porter Cup at Niagara Falls (N.Y.) Country Club. He closed with a 70 for a four-day total of 286. Chan Kim, another former Hawaii state high school champion, tied for sixth at 67–275. He was eight shots out of first.