MIAMI -- Osiris Johnson made a spacious Marlins Park look small during Monday's batting practice, giving players and management a reason to stop everything and get a glimpse of the future.
The Marlins' second-round pick in the 2018 MLB Draft officially signed and worked out with the team in the afternoon. He will report to Miami's Gulf Coast League affiliate in Jupiter, Fla., on Tuesday.
"I'm glad to be part of the organization," Johnson said, wiping sweat away from his brow after partaking in the team's full warmup routine before its evening matchup with the D-backs. "I'm glad [the Marlins] chose me with their second-round pick. I'm ready to start."
Despite being one of the youngest prospects from this year's Draft class, as Johnson is only 17 years old, the 53rd overall pick from Encinal High School (Calif.), showcased his raw talent, speed and agility, along with a swing that packs a punch. He is the cousin of former big leaguer Jimmy Rollins.
In the cage, Johnson showed power to all fields, as he consistently smashed line drives to both gaps, at one point crushing three straight towering home runs to the hedges over the wall in straightaway center.
"For a young, very young, Draft pick, he held his own," president of baseball operations Michael Hill said. "With Osiris, you see a package … a part of the future and what we think will be a very good player for us in the years to come."

Moments after turning heads at the plate, Johnson jogged out to shortstop, the position where he looks to fine-tune his skills and make a name for himself in the Marlins' farm system. He was comfortable, moving laterally with smoothness and quickness as he fielded and fired across the diamond with ease, making manager Don Mattingly's glove pop as he shagged at first base.
"When we talked about our Draft philosophy, we talked about building up the middle, building with athletes, guys who are capable of impacting the game on both sides of the ball with their speed, their defense, offensively," Hill said. "[He's] an athletic shortstop as you guys saw him field there during batting practice, a live body … so we're excited that it's official now. He's on board."
Johnson, who had committed to play collegiate ball at Cal State Fullerton, went to the same high school in Alameda, Calif., as former Marlins left-hander Dontrelle Willis, as well as Hall of Famer Willie Stargell and Rollins.
After inking Johnson, the Marlins have agreed to terms with each of their 11 picks from the first 10 rounds in this month's Draft, as their third-round pick, outfielder Tristan Pompey from the University of Kentucky, is poised to sign in the coming days.
"When you make the Draft and draft your players, the ultimate goal is to get out and start your career as soon as possible," Hill said. "Our scouting department has done a tremendous job in getting our guys signed, getting them out and playing and starting their professional careers."
Johnson spent the vast majority of his time at the ballpark with outfielder Lewis Brinson, and although it's far too early to tell if the two will play together in the Major Leagues down the road, Johnson was confident and concise when asked what his plans were moving forward.
"Just try and showcase my skills and get to the bigs as fast as I can," Johnson said.