Sam DuBois picked up the loose ball, turned and flung. What the Champlin Park lefty's shot lacked in form, it more than made up for in drama.

DuBois' heave — from a few feet beyond the NBA three-point line — settled softly into the net as time ran out, rescuing No. 1-ranked Champlin Park from an unthinkable first-round exit with a 53-50 victory over Chaska on Wednesday in the Class 4A quarterfinals at Target Center.

"That's the biggest [shot] I've ever made in my life, and it's not even close," DuBois said.

As the undefeated top seed in the Class 4A tournament, and with a heartbreaking loss in the 2015 Class 4A championship game still lurking in the backs of their minds, the Champlin Park players even admitted to feeling pressure before facing Chaska.

That, Champlin Park center Theo John said, was a big reason the Rebels weren't sharp against the aggressive Hawks.

"Each and every day, we feel like we have to go out and prove something," John said. "This morning, we just weren't awake. We weren't on our game."

Chaska closed the first half with a 10-2 run to take a 30-22 halftime lead, which they maintained for most of the second half.

That may have spelled doom for lesser teams, but Champlin Park (30-0) has McKinley Wright, the Star Tribune Metro Player of the Year, and the senior guard led the Rebels' second-half rally. Wright scored 30 points, 18 after halftime, getting to the basket every time his team needed a boost.

At Champlin Park, it's called "McKinley Time."

"At halftime, my teammates said they had to get stops and they had to get me the ball," he said. "They trusted me to score the ball."

"No question, he's the best player in the state," Chaska coach Dana Kallman said.

With the score tied 50-50 with time running out in the second half, Champlin Park slowed the game down, not wanting to give Chaska, which had made nine of 21 three-point attempts, a chance for a winning basket.

With five seconds left, Wright slid left down the lane, but his pullup 10-footer missed. John, who finished with 11 points and 16 rebounds, slapped the ball toward midcourt, where DuBois hauled it in and hit his game-winner.

"I saw Theo tap the ball out and, at first, I was running to it to make sure they didn't go down and get an easy layup," he said. "I caught it and put it up and it fell. Even when you're a little kid, shooting into a trash can, you think '5-4-3-2-1'. You never think it's actually going to happen, though."

For Chaska (24-6), it was a crushing ending to a game the Hawks could very easily have won.

"The hard part is that we haven't lost since Jan. 20," Kallman said. "I'm really glad the high school league added a consolation bracket because these guys didn't deserve to end their season that way. They deserve to get out there and battle again tomorrow."

Andrew Kallman finished with 18 points for Chaska.