DeMers is a University of Washington commitment and three-time gold medalist with USA Baseball national teams who is considered among the top prospects in the Major League draft.
With his team trailing in the second on an unearned run, he walked, took second on a ball that bounced away from the catcher, stole third and scored on a passed ball.
He singled to drive in an insurance run in the sixth.
Oh, and he threw a complete-game three-hitter, striking out six, turning a double play on a comebacker on his 104th pitch.
Is there anything this guy can't do?
"Not that I've seen yet," Falcons coach Andy Tarpley said. "He sets his mind to doing something, it usually gets done, for sure."
Farragut coach Matt Buckner is a believer, too.
"He was good," Farragut coach Matt Buckner said. "He got in more of a groove and started throwing his off-speed pitches for a strike a little more. That made him a more difficult customer than he was early on. The guy is obviously a good baseball player."
Wednesday, that was enough for College Park to advance to Thursday's NHSI quarterfinals at the USA Baseball National Training Complex. The Falcons face Loyalsock Township (Pa.) at 11 a.m. EDT.
It wasn't anything unusual for Tarpley.
"He usually is like that," Tarpley said. "Very composed, polished, pitches at his own pace, I've seen it better, but it was still good enough to win, and the guy knows how to compete.
"We played catch behind him besides the first inning jitters, second-inning jitters, once we settled down we felt good about it."
The early jitters resulted in two errors and an unearned run for Farragut in the second.
DeMers made sure that was all. One of the few bumps he faces was before the game, when he was forced to change gloves because his was not dark enough.
Afterward, he was asked which game was bigger, Wednesday's win at the NHSI or the perfect game he threw earlier this season.
"Definitely this game," DeMers said. "Coming out here and getting a win against one of the best teams in the country, that's something special."
The original plan was to take DeMers out early, giving College Park the potential to bring him back to the mound later in the tournament.
In a tight ballgame, that didn't work out.
"You've got to win, Tarpley said. "We were hoping that we came out and hit the ball a little bit better, but their guy is really good."
Farragut's guy was Vanderbilt commitment Patrick Raby, a 6-3, 220-pound senior right-hander.
Raby matched DeMers, pitch for pitch.
"Patrick, I thought he was really, really sharp today," Farragut coach Matt Buckner said.
"I thought he was tremendous. I thought he had his best stuff, throwing three pitches and commanding three pitches. He was excellent, as good as I've seen him.
"I told the guys before we started today that if we play great defense, we'll have a great chance to win. And then we didn't. That's the bottom line."
The bottom line for College Park is that they've got the field's attention.
"We're definitely on the map now," Tarpley said. "A small public school from Pleasant Hill, Calif., with barely 2,000 students.
"Taking a public school back to North Carolina, it's not once in a lifetime, it's once in forever you get an opportunity like this. We're privileged."
And, they have Joe DeMers.
Notes: The College Park community got behind the baseball team for the trip to Cary, and the team was able to raise $35,000 to make sure all the families could come along. … DeMers got a visit from the Falcons' pitching coach at the mound with runners on first and second in the seventh. But it wasn't to take him out. "I think he was more or less giving him a breather," Tarpley said. "He spent the whole time, made the umpire come out and take care of it." … The core of the College Park team has been playing together since they were 10 years old. "They're like brothers," Tarpley said. "It's a little more personal, if you will." … For his part, DeMers wasn't impressed with his pitching. "I didn't have my best stuff today, but I was just pounding the zone and it worked out," he said. … DeMers was asked how many stolen bases he has in his career. "I don't know," Demers said, before Tarpley jumped in. "That's not his first," Tarpley said. "He runs the bases well. He's smart, and he understands the timing of it." … DeMers has been to the National Training Complex many times, as part of four USA Baseball national teams. "This is like my home field," he said. "I have played more games here than on any field other than College Park, so it's good to be back."
Follow Mike Persinger on Twitter, @mikep_nhsi.