"I knew we had to stay in the game and shut them down," Tracey said. "My curveball was finishing them off."
South Mountain had a 7-0 lead after two innings. Travis Stone drove in one run on a sacrifice fly and two more on a single. Reed Canter and Trevor Walsh each collected an RBI.
Dalton Condo had an RBI groundout and Jordon Edlund added a two-run single in Valley's six-run third inning that trimmed South Mountain's lead to one.
"We came out nervous, but after the first run we just built up from there," Valley manager Doug Butrick said.
Five more Valley runs scored in the fourth inning, including two off Tracey's blast. Quintin Zimmerman scored on an error, Condo drove in one more with a sacrifice fly and Brandon Butrick scored on a wild pitch.
Valley had an 11-8 lead heading into the fifth inning and tacked on six more runs, with Butrick's RBI triple and Edlund's three-run double leading the way.
Condo and Steve Clapper had RBI singles, Anthony Morton uncorked a two-run single and two more runs scored on an error as Valley piled on six more in the sixth.
"Tough loss," South Mountain manager Joe Schofield said. "We didn't get the calls and couldn't make plays."
Valley will play at Conococheague in the winners' bracket final on Wednesday, while South Mountain plays at Hancock in a losers' bracket game on Monday. Both games are at 5:30 p.m.
