After scoring 21 first-half points in every way imaginable, life wasn’t as easy for Jalen Echevarria in the fourth quarter.
Cardinal Spellman blanketed him, threw double teams at him and got him out of his rhythm, but Echevarria stayed ready. When the moment came to let it fly, the junior guard didn’t hesitate.
He buried a 3-pointer with 24 seconds left to put St. Mary’s ahead, 67-63, and seal an eventual 68-64 road win in Brockton. The Spartans (6-1, 4-0) remained undefeated in the Catholic Central Large while handing the Cardinals (5-2, 3-1) their first conference loss of the season.
Echevarria finished with a game-high 29 points, but no shot was more pivotal than his last one.
“I had been hot the whole game, so if I’m wide open I’m going to shoot it,” Echevarria said. “It felt good coming off my fingertips.”
The Spartans led at halftime, 37-28, and extended it to 16 points (60-44) entering the fourth quarter. They appeared to be on their way to a breezy win, but the Cardinals had other ideas.
Led by senior forward Mike Spencer (19 points), Cardinal Spellman ripped off a furious 16-0 run to open the fourth, evening the score at 60 with 2:16 remaining.
Joseph Abate-Walsh (22 points) buried three free throws seven seconds later to help the Spartains regain the lead, but Echevarria’s 3-point dagger proved to be the difference.
“It was nice to see the guys win a tight game, on the road, against a very good basketball team,” said St. Mary’s coach David Brown. “We settled down and we were able to attack the hoop and get to the free throw line.”
Tech Boston 88, West Roxbury 56 — Walter Hollis had 28 points, Shamar Moore had 20, and Shamar Browder had 16 as the Bears rolled to a blowout win.
Central Catholic 70, Andover 65 — Sophomore George Smith scored 20 points and junior Kevin Constant had 16 for the Raiders (6-2).
Beaver Country Day 69, Winsor 62 — Maddie Mullin piled up 29 points for BCD in the 7-point victory.
Walpole 67, Weymouth 36 — Senior captain Bridget Lancaster had 12 points and five rebounds for the Rebels.
Natick 60, Pembroke 49 — Sophomore Brenna McDonald scored 25 points and had 11 rebounds for the Redhawks (7-1).
Boys’ indoor track
Lynn Classical 50, Salem 36 — Senior Adam Washington qualified for states in the high jump with a 5-foot-9-inch leap. Classmates Sampson Srey (7.5 seconds in 50-meter hurdles), Eli Kalambayi (5.7 seconds in 50-meter dash) and Dajon Wilson (39.7 seconds in the 300-meter dash) also were winners.For more highlights, go to bostonglobe.com/schools.