SOUTH WILLIAMSPORT, Pa. — Keelen Obedoza hit a two-run homer in the bottom of the fifth inning to break a tie and pitched a perfect sixth to lead Waipi'o to a 6-4 come-from-behind victory over Rapid City, S.D., at the Little League World Series.

"I was pretty excited to hit a homer," said Obedoza, who got his first hit of the series. "It has been a while since I hit like that."

Undefeated Hawai'i (3-0) is guaranteed a spot in the U.S. semifinals.

Waipi'o will face the No. 2 team from Pool A.

South Dakota's Cale Fierro tied the game at 4 in the top of the fifth with a homer. Wai-pi'o went back ahead in the bottom of the inning after Kainoa Fong singled and Obedoza homered to center.

Obedoza then retired the side in order in the bottom of the sixth on nine pitches to earn the save. Jedd Andrade pitched an inning and got the victory. With a spot in the semifinals already wrapped up, Waipi'o used seven pitchers in the game.

"We tried to save our pitching since we had nothing to lose," Waipi'o coach Timo Donahue said. "We faced the same type of situation in regionals, so we were prepared for this."

South Dakota (0-3) went winless in the first appearance for a team from the state at the World Series.

Kaina Fong batted 3 for 3 and Pikai Winchester had two hits. Khade Paris drove in two runs.