Kailua closed out the best OIA baseball regular season of any team on a somber note.

On Monday, the sixth-ranked Surfriders finished off a game against Kaiser that was suspended on Thursday, winning 12-5 to end up with an 11-1 record and the No. 1 seed out of the OIA East heading into next week’s playoffs.

Kailua finished its regular season without head coach Corey Ishigo in attendance. Assistant coach Travis Teshima, who handled the head coaching duties on Monday, said Ishigo had to go to the hospital due to a heart condition but is feeling better.

“We came here to take care of business and close things out, but our heads were obviously elsewhere,” Teshima said. “(Corey’s) doing better … he was on everyone’s mind today.”

Ishigo has guided Kailua to five OIA titles in the past 12 years and has advanced to the state-title game four times, winning it all once in 2001.

The Surfriders have put themselves in a position to win the OIA for the first time since 2005, claiming the top seed in the playoffs by winning their last eight.

Kailua started last week a game up on Kaiser (8-4) and outscored the Cougars 25-8 to win both games.

“It’s been slow getting there, but I think we’re heading in the right direction,” Teshima said. “We still have two-thirds of the way to go to reach our goals but it was a good steppingstone.”

Kailua led 11-4 midway through the sixth inning when the game was halted on Thursday due to darkness after the umpires showed up 45 minutes late.

After beating the Cougars 13-3 on Friday, the teams wrapped up Thursday’s game on Monday at Kaiser.

Tyler Lau tripled and scored in the bottom of the sixth for Kaiser, but Eli Davidann answered with a home run to the opposite field in the seventh to put the Surfriders back up by seven.

“I was up 2-0 and looking for fastball away and if you can get it up into the wind at this field, the ball will carry,” said Davidann, who was offered to walk-on at the University of Hawaii but will attend College of Southern Idaho instead. “This (week) was the first time we 10-run ruled a team all season so things are finally starting to come together.”

The two losses dropped Kaiser to third place in the OIA East, a game behind Moanalua.

The top two teams in each division receive a first-round bye. Kaiser will open with Leilehua, the sixth seed out of the West, next Wednesday despite finishing with a better record than any OIA West team.

Waianae, Pearl City and Campbell all tied for first in the West at 7-5.

Kahuku (0-12) and Kapolei (4-8) are the odd teams out.

Christian Kapeliela doubled to drive in Manoah Medrano and scored the eventual winning run on Dustin Nakayama’s triple as the Knights edged the Falcons.