AUGUSTA — He’s listed as John Brocke in the program, but he prefers to be called “Jack.” After his performance Wednesday, maybe “Sir” would be more appropriate.

Brocke, a 6-foot-4 senior, scored 15 points, grabbed 10 rebounds and blocked two shots as second-seeded St. Dominic Academy shut down No. 3 Telstar 47-28 in a Class D South boys basketball semifinal at the Augusta Civic Center.

St. Dom’s (19-1) will face No. 1 Valley for the regional title at 2:45 p.m. Saturday in Augusta. Telstar finished 14-5.

With his black-framed glasses, Brocke looks like a throwback to the 1950s, but his performance was thoroughly modern, as he was a constant threat from inside or out and had a big impact both offensively and defensively.

“He used to really just be a shooter, and then this year he’s dunking, he’s adding the midrange to his game, (he) looks to drive it to the hoop more, and on defense he’s really good,” said Saints coach Josh LaPrell, who estimated Brocke had 60 blocks in the regular season.

Brocke’s most spectacular play came midway through the third quarter. He missed an attempted dunk, sending the ball flying. Rather than contemplate his error, Brocke hustled for the ball, recovered it outside the 3-point line and heaved up a perfect shot to give the Saints a 32-14 lead.

“I think I jumped a little too horizontally to actually get the dunk, but nobody was guarding me at the 3-point line, so I just let it fly,” said Brocke, who admitted he didn’t feel well when he woke up Tuesday morning and wasn’t sure if he was even going to play.

Later in the quarter, Brocke dunked successfully.

Added LaPrell: “I joked to our assistant that was the new play we put in.”

How St. Dominic did it

• The Saints — whose starters are all 6-1 or taller — relied on an in-your-face defense that created steals and dominated the boards. St. Dom’s held advantages of 16-8 in steals and 34-27 in rebounds. LaPrell said his team did not stick to its game plan in Saturday’s 75-53 quarterfinal win over Forest Hills.

“(Wednesday) was back to the way we’ve been playing all season, so it was good to see the work we’ve done the last two days pay off in the game,” he said.

• St. Dom’s largely shut down Telstar’s 3-point threats, including Brody Morgan, Reiley Hedden and Connor Deprey. Hedden had only one 3-pointer — three days after draining six in a 74-67 overtime win over Wiscasset on Saturday. The Rebels managed only four triples as a team Wednesday.

“They were keying on Reiley; they didn’t want to get him open looks,” said Telstar coach Ryan Kimbell, who said Hedden wasn’t 100% going in. “Focusing on him and not being his usual self — it was a struggle. They’re tough to shoot on anyway because they’re so long, they contest. You’ve got to shoot up over the top of them.”

Key moment

The score was tied 7-all after one quarter before St. Dom’s outscored Telstar 16-4 in the second to pull away. Brocke, Jonathan Tangilamesu and Ayden Rand scored easy buckets from the paint, and Taylor Varney capped the period with a layup off his own steal with 39 seconds left.

“We started pretty slow, but we just tried to keep our energy up and keep our teammates positive,” Brocke said.

Let ’em play

The teams combined for only 13 fouls, two by St. Dom’s. The Saints had 28 fouls in Saturday’s quarterfinal win, LaPrell said.

Statistical leaders

St. Dominic: Brocke (15 points, 10 rebounds, two blocks), Varney (12 points, seven steals), Isaac Yombe (nine points, 10 rebounds, three steals)

Telstar: Morgan (18 points)