BROCKTON — Before he took the mound at Campanelli Stadium on Wednesday night, North Andover ace Sebastian Keane already had two runs on the board.

Less than a week after being drafted by the Red Sox, the 6-foot-3 senior righthander allowed just two hits while striking out 15 over eight dazzling innings as the Scarlet Knights (19-4) punched a ticket to the Super 8 final with a 5-0 win over Walpole.

North Andover will have the weekend off while third-seeded Walpole (18-5) drops into the elimination bracket. The Rebels will play the St. John’s Prep/BC High winner (Friday) at a date to be determined.


“It was the best feeling getting those insurance runs,” Keane said. “You’re just so excited to go out there when you know your team’s got you. I felt good and all my stuff was working. We got a win and that’s all that matters.”

Jake McElroy (2 for 4, 3 runs) led off the game with a walk and scored on a wild pitch before an out was recorded. Later in the first, Keane lifted a sac fly to right, scoring Thomas Finn for a 2-0 lead.

An inning later, McElroy tripled home Joe Quinlan and then scored on Finn’s sac fly for a 4-0 lead off Walpole starter Cam Schlittler, who like Keane, has committed to Northeastern.

Junior catcher Jack Morin added a pair of RBIs in the fourth and ninth.

“[Sebastian] was working really well and when he’s pounding strikes like that he’s tough,” North Andover coach Todd Dullin said. “I love this group of kids and they enjoy playing together.”

BC High 10, Mansfield 9 — The Eagles (15-8) scored eight unanswered runs, then proceeded to allow eight unanswered runs, but kept their season alive with a wild victory over Mansfield in a Super 8 elimination game in Brockton.


Junior Pat Roche delivered a walk-off RBI single in the bottom of the ninth in the wild win over the seventh-seeded Hornets at Campanelli Stadium. The Eagles will play Catholic Conference rival St. John’s Prep on Friday at 4.

“The bench was behind me and the team stayed together the whole time,” Roche said. “No one was jabbing at each other and that’s what happens. You get a good team win.”

Highlighted by Charlie Devin’s bases-clearing double and Aidan Carey’s two-run double in an eight-run third inning, the fifth-seeded Eagles (15-8) seized a commanding 8-1 lead.

But the Hornets (18-7) battled back to score three runs in the fourth and four more in the sixth to tie it, 8-8. Sam Nugent and Eric Longley delivered clutch hits in the rally.

After Mansfield took a 9-8 lead in the seventh, Sean O’Connell tied it up with an RBI single in the home half of the inning, before Roche’s hit in the ninth scored pinch-hitter Steve Parsons from second.

“This is the first time this year that we’ve actually done this,” BC High coach Norm Walsh. “It’s the first time we’ve come back and done what we needed to do.”

Matt Doherty can be reached at matthew.doherty@globe.com.