Chiaradia hit four foul balls before working a bases-loaded walk in a nine-pitch encounter that produced the only run in the fast-paced, well-played game.
"I was just trying to put the ball in play," Chiaradia said. "I thought maybe I could get a boot [error] or get one back up the middle.
"I just kept fouling them off. [Murphy] is a great pitcher. He finally threw me that last pitch, and it was a ball."
The victory popped the cork on a postgame celebration for Audubon (14-6), which advanced to face St. Augustine in the quarterfinals Saturday at Deptford.
St. Augustine won the first game at Maple Shade by 5-2 over Clearview as senior righthander Joey Gatto pitched a complete game with seven strikeouts and senior second baseman Dylan Tolbert went 3 for 3.
"We needed this bad," Terifay said. "That [Gloucester Catholic] is a great team over there. But we know we can play with the big teams, and this gives us a lot of confidence."
Murphy was the hard-luck loser for Gloucester Catholic (15-5), the No. 3 team in The Inquirer's South Jersey rankings. The Maryland recruit allowed one unearned run and just four singles and struck out six.
"You can't win a game if you don't score any runs," Gloucester Catholic coach Mike Rucci said. "It's an upsetting loss, a disappointing loss. We didn't have too many good at-bats."
Audubon played strong defense behind Terifay, as third baseman Austin Polidoro, shortstop Dillon Tassi, and second baseman Mic Mannion handled 10 chances without a miscue.
Tassi made a nice play on Phil Dickinson's sharp grounder up the middle in the third, and Polidoro flashed the leather on a hard grounder by Mike Garafolo in the fifth.
In the seventh, centerfielder Eric Schorr made a running catch of a liner by Jake Gillis, and Tassi and Mannion ended the game by combining for force-outs on a pair of well-struck balls.
"My defense was great," Terifay said. "I couldn't have done it without them."
Audubon ground out the game's only run. Polidoro led off the third and reached on an infield error. Terifay dropped a sacrifice bunt, and Tassi punched a single to right to put runners on first and third.
After a strikeout, Mannion and Chiaradia worked walks on 3-2 counts, the latter after falling behind 1-2 and fouling off four of Murphy's 90-m.p.h. fastballs.
"That at-bat," Horan said of Chiaradia's work at the plate. "That's what it's all about."
Gloucester Cath. 000 000 0 - 0 5 1
Audubon 001 000 x - 1 4 1
WP: Kevin Terifay. LP: John Murphy.
See and hear from Audubon's Kevin Terifay.