Haddonfield, the No. 2 team in The Inquirer's South Jersey rankings, held No. 8 Holy Spirit to 16 points in the second half, including just three in the fourth quarter.
"This was a huge game for us," Stavetski said. "We knew they were a very talented team and people were saying that we don't play that many good teams."
Senior forward Junior Saintel scored 18 for Holy Spirit (14-5).
"Our kids battled hard," Holy Spirit coach Jamie Gillespie said. "We just didn't make enough plays, especially in the fourth quarter."
Gillespie said one of the keys to the game was Haddonfield's work on the offensive boards. The 6-foot-5 Bah was particularly effective, scoring eight of his points on putbacks.
Haddonfield was just 4 for 14 from the foul line, but the Bulldogs compensated with their defense and offensive rebounding.
"That's the way we have to play," Stavetski said. "Everybody gives 110 percent, guys diving on the floor. Our practices are the same way."
Haddonfield's secret to success was underscored by that endless possession early in the fourth quarter.
The Bulldogs missed three shots from the field, and the possession concluded when Robinson missed two free throws.
But in the interim, Robinson grabbed two offensive rebounds and Stavetski grabbed one, and Rob DePersia stole the ball from a Holy Spirit player who had managed a defensive rebound.
"I remember that possession," Gillespie said. "We talked about it after the game. But it wasn't just the fourth quarter. They hurt us on the offensive glass all game long."
Haddonfield coach Paul Wiedeman said the struggles at the foul line and inability to convert a two-minute-long possession into points were typical of the Bulldogs.
But so was their stingy defense, success in scrapping for loose balls, and relentless work on the offensive glass.
"Our tenacity outpaces our skill," Wiedeman said.
Haddonfield 18 13 13 7 - 51
Holy Spirit 12 14 13 3 - 42
H: Nick DePersia 8, Rob DePersia 9, Ted Stavetski 8, Jake Robinson 9, Abby Bah 17.
HS: Junior Saintel 18, John Middleton 9, Leon Daniels 2, Umhad Collier 11, Tyler Jones 2.
Haddonfield's Jake Robinson discusses the Bulldogs' victory.