GREAT BARRINGTON — The sixth-seeded Monument Mountain boys soccer team used a confident defense and picturesque passing to knock off No. 11 Hampshire Regional, 3-0, in the Western Massachusetts Division 3 Tournament first round Saturday.

Robert Baldwin tallied three points, including a pair of goals, while Wilson Sprague and Tristan Alston formed an impenetrable perimeter around Kevin Kelly’s 18-yard box. The senior goalkeeper needed to make just two saves in a shutout effort that sends the Spartans into the quarterfinals.

Monument (8-6-3) will travel to take on two-time champion and No. 3 Frontier Regional (11-2-4) in the quarters, Monday at 6 p.m.

“We had time, and our goal was to just stay composed and not get caught on the long ball,” Alston said. “We wanted to talk to the guys in front of us and really command the game, stay positive and not let up at all.”

Hampshire finished 7-12. It was the final game for seniors Griffin Craig, Mason Lollis-Taylor and Derek Barber.

With 18 minutes remaining in the first half, Monument’s Nate Lacombe put a ball in the Raiders box from along the end line. Hampshire got hold of it, but the clear attempt popped out to Patrick Yeung at the right corner. He caught the eye of a streaking Baldwin and lofted a cross that allowed the tall attacker to bat the ball down into the net with a header.

On the second goal, Baldwin put a through ball on a string and guided it deftly in between Lacombe and defender Andrew Cebula as the two raced shoulder-to-shoulder at the Hampshire net. Lacombe touched first and blasted a shot by Colin Boyle for the 2-0 lead with 16:35 remaining in the game.

“I was just trying to find the open space. We tried a new formation today and it opened up a lot of space against this particular team and got us out of a rough patch that we’d been having,” Baldwin said.

In the 73rd minute, Kosta Cami launched a long throw from the sideline deep in Hampshire territory. Moving left to right, Ben Badurski kept things flowing with a pass across the box to Baldwin, who used a strong kick to go top-shelf and put the first-round game away.

“We know we’ve been scouted and had a lot of teams come look at us, so we changed a lot to give teams a different look and it paid off today,” Monument coach Matt Naventi said. “The second goal was big. We missed a couple golden opportunities early in the second half and you can’t let teams linger. They hit the post, put a little pressure on us. It relieves that pressure and opened the game up, which is what we needed.”

Despite the 3-0 final, the Spartans played more than 63 minutes either deadlocked or with a one-goal lead on Hampshire. What kept the game in hand was the work of Sprague and Alston on the back line and a strong possession-based midfield game. During a five-minute stretch after Baldwin’s first strike, the Raiders earned three corner kicks and a freebie from 40 yards out on the left side. All of those set plays resulted in a Monument first-touch, usually the head of Alston, and a relatively simple clear.

Hampshire had a shot to knot things up with plenty of time left, but Justin Szwajkowski’s boot met the crossbar seven minutes into the second half.