Maybe they didn’t tell Lakes pitcher Tim Ohlwein that he was starting against a Carmel Catholic team that had won 10 straight.

The senior retired 11 Corsairs in a row on Thursday afternoon at the St. Viator sectional before his perfect game vanished with a fourth inning walk. And then his no-hitter, shutout and lead all vanished on a 2-run blast by Carmel junior Eddie Pietschmann.

“It was just one bad pitch,’’ Ohlwein noted.

Ohlwein did eventually get his win as Lakes prevailed 5-2.

The save went to Ben Milewski, in more than one sense. Sure, the right-hander got the last six outs of the game but he also dealt a huge blow to the Carmel win streak. Milewski’s 3-run double highlighted a 4-run fifth inning.

Lakes (19-14-1) will play for a Class 3A sectional crown — the deepest playoff advancement for any Eagles team as they won in a sectional for the first time.

Lakes will play the home team, St. Viator, in matchup scheduled for 10 a.m. Saturday.

“This is like a dream,’’ Milewski said. “I got to help my team. It was a 2-1 pitch and he (Carmel’s Chris Baumann) had just missed with a curve. I knew I was getting a fastball.”

Milewski scored when Simon Varitek followed with a single up the middle.

Ohlwein departed after 5 innings of 1-hit ball.

“We have only four seniors on this team,’’ said Lakes coach Ray Gialo. “Tim and Benjamin have helped carry this team. Maybe no one thought we would win, but we thought we had a chance.”

One homer and 2 singles did not produce much offense for this hot Carmel club.

“We had a lead,’’ said Carmel coach Bill Taylor. “But their pitching shut us down.”

The Eagles opened up the scoring in the first. After two were out, Max Swiatek roped a double. The senior came home on the first of 4 RBI from Milewski.

While Ohlwein worked on his perfect game, Lakes threatened to score again in the third but Baumann closed the frame without any runs scoring.

Ohlwein recovered from the Pietschmann’s blast and retired the final four batters he faced.

The big inning for Lakes started at the bottom of the order. Third baseman Brandon Khan roped a double. Two walks a fly out to right set the table for Milewski’s big hit.

“I’m the closer on the team,’’ Milewski said. “I’m guessing my reward is to get fed at home.”

Milewski retired the first two hitters in the seventh, including Carmel catcher Cooper Johnson on a loud blast to left. Johnson is headed to Mississippi for collegiate baseball next year.

Lakes left fielder Conner Chamernik collared the final flyball of the game and the Eagles had indeed made school history.

Taylor was proud of the way his Corsairs played down the stretch.

“We ran the table to win the conference,’’ Taylor noted. “We were 13-9 at the seeding meeting — and we finished 23-10.”

St. Charles North 5, Lake Park 4 (8 inn.): The Lake Park baseball team nearly landed the Class 4A Schaumburg sectional’s biggest fish Thursday, but No. 1 St. Charles North slipped the hook and notched a 5-4 victory in 8 innings.

No. 6 Lake Park (22-13) tied the sectional semifinal 4-4 with 2 runs in the top of the sixth inning and seemed poised to take the lead in the eighth when it loaded the bases with no outs against St. Charles North reliever Christian Sidoti.

The senior right-hander responded by striking out Joe Kennedy, who in his previous at-bat had doubled and driven in a run.

Sidoti then induced a tapper back to the mound from designated hitter Dom Fallico, whose sixth-inning single had tied the game. Sidoti calmly threw home to catcher Erik Rabin to begin an inning-ending double play.

“I kind of zoned back in and flushed what was happening,” said Sidoti (3-1). “I knew I could rely on the guys behind me if I kept the ball down and got a little groundball, and that’s what happened. After they turned the double play and got out of the inning, I knew the guys were going to pick us up and get that big winning run.”

Indeed, St. Charles North (30-6) capitalized on the momentum from its escape. Senior John LeGare led off the eighth by drawing a walk from senior right-hander Connor Cook (6-5), working his second inning in relief for Jim McDonald, who allowed 4 unearned runs on 5 hits in 6 innings.

St. Charles North (30-9) proceeded to load the bases with no outs. Sam Faith was hit by a pitch and Conor Bizik was intentionally walked after Cook balked.

No. 8 hitter Zach Fick subsequently flied out to center field. The ball was too shallow for LeGare at third base to tag and score, but he crept down the line when it looked as though the throw from center field would overshoot catcher Zach Aehlert with nobody backing him up.

However, Aehlert made a leaping catch and immediately threw to Jamison at third to catch LeGare in a rundown. The third baseman ran LeGare straight toward Aehlert. At the last moment he flipped the ball to the backtracking catcher, but it glanced off his mitt and fell to the ground as LeGare dived to the plate safely to send St. Charles North to Saturday’s sectional championship game.

“That could have been the end of our season, but we had to believe,” LeGare said of the eighth-inning transition from hunted to hunter. “We had to believe that this is the team that could go far and do something no other North team has done before.”

The win advances the North Stars to a sectional final for the third time in their history and the first time since 2010. They will play the winner of today’s Class 4A Schaumburg sectional semifinal between No. 3 St. Charles East (23-14) and No. 7 Batavia (24-10) at 4:30 p.m.

Stunned by the turnaround, the Lancers had trouble digesting the turbulent eighth inning.

“We played the No. 1 team in the area as tough as you can play them,” Lake Park coach Dan Colucci said. “I think they’re breathing a sigh of relief that they got away with the win. I mean, how else do you call going from bases loaded nobody out in the top of the inning to that? They’re a great team, don’t get me wrong. But we had ’em. We had ’em. We just didn’t finish it. Best of luck to them on Saturday. They’re a great club.

“I’m proud of my guys and they way they did battle. I wish for these guys that it would have turned out a little bit differently. Tough way to walk off the field.”

— Jerry Fitzpatrick