Central Catholic carried play for much of the game. The Raiders held a 33-23 shots advantage.
Still, Austin Prep, which scored on its first two shots, iced the Raiders, 2-1, in an MIAA Division 1A quarterfinal at the TD Garden in Boston.
Elsewhere, Shawsheen Tech and Lowell Catholic were eliminated in Division 3 North quarterfinals.
Austin Prep 2, Central Catholic 1
Junior Elijah Harris made 32 saves to backbone the Cougars.
The teams will play their second game in a best two-out-of-three series on Thursday at the Tsongas Center in Lowell (8 p.m.).
AP scored on their first two shots.
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Sophomore Jake McKenelley netted his fifth of the season at 2:51 under the stick of Soucy. Senior defenseman Andrew Cross assisted on Carpenter's goal, and sophomore left wing Mike Egan (Billerica) added the helper on the second goal.
Central scored a two-man advantage goal at 13:49 of the final period after it pulled Soucy for a sixth skater. Junior Christian Thompson scored from Richie Greenberg and Lloyd Hayes.
The final minute was intense, as Central put six more shots on Harris, and he withstood the deluge.
Division 3 North
Newton So. 6, Lowell Catholic 1
Trailing just 2-1 after two periods, Lowell Catholic was unable to stop third-seeded Newton South in the final period at Stoneham Arena.
Newton South scored four goals in the final period, the last one into an empty net.
"The score is not indicative of the game at all," LC coach Tom Curran said.
No. 6 Lowell Catholic (12-8-2) ripped Latin Academy in its tourney opener, 9-2.
Junior forward Thomas Willegal, returning to the ice after missing several games with a separated shoulder, pulled Lowell Catholic to within 2-1 in the second period.
Willegal's goal was set up by Jesse Caisse and Griffin Rega. Senior forward Will O'Neil played an outstanding game for the locals. Lowell Catholic, which won the Catholic Central League Small title for the third straight year, graduates seven seniors.
Watertown 2, Shawsheen 0
Top-seeded Watertown controlled play for much of the game at the Chelmsford Forum.
But Shawsheen trailed just 1-0 entering the final period thanks to junior goalie Ryan Barnard, who finished with 34 saves. Watertown made 2-0 five minutes into the third.
"These kids played their hearts out," ST coach Chuck Baker said in praising his Rams.
Senior forward Brandon Gentile played an outstanding game for the ninth-seeded Rams (12-10), as did senior defensemen Alex Mosca and Jim Gautreau. Shawsheen graduates nine players.