It was Plummer's second long ball in the past few days. He was also one of the best players at last week's East Coast Pro Showcase in Syracuse, N.Y., where he went 7-for-13.
Plummer hasn't slowed down at this week's Area Code Games, and his recent run of success has put the toolsy center fielder on the map as a top-notch all-around talent among next year's class of high school seniors.
It also earned Plummer some surprising news -- a late invite to this year's Under Armour All-America Game.
"It was shocking," Plummer said after his game Thursday. "I know they already had the rosters set, but I really appreciate it, being added. All the hard work paid off, and it'll be nice to cap off the summer with that."
In short, Plummer set two goals this summer, and he not only met them -- he exceeded them.
"Coming in, I wanted to make the East Coast Pro, and I made the East Coast Pro," Plummer said. "Then I wanted to make the Area Code Games, and I made them. The Under Armour, that's a bonus."
A five-tool player with a smooth-yet-compact left-handed swing, Plummer can make his impact felt in a variety of ways.
In a tie game in the seventh and final inning on Thursday, Plummer worked a leadoff walk and quickly stole second and third, setting himself up to score the winning run on a single by Brady Cherry.
"It wasn't the best day at the plate, but I know I'll be able to change a game with my legs," said Plummer, a University of Michigan commit. "So I'm just trying to do the best I can for the team."
Only 5-foot-10, Plummer is very well-built. His 200-pound frame produces plenty of power with a muscular upper half.
Plummer, who attends Brother Rice High School, has started since his freshman year. He didn't step onto the national scene until this month, but he always felt the potential was there.
"Since I started playing in high school, it really hit me what I could do with my game," Plummer said. "I was starting on varsity and hitting third. Right then, it kind of hit me that I could make something of this. I just have to keep working hard."
So what is he trying to accomplish now that he's suddenly gotten the attention of national scouts?
"I'm trying to show my tools, all my five tools," Plummer said. "And at the same time, I try to go out and have fun and play the game the way it should be played."