2025 MLB Draft Profile: Jamie Arnold

Overview

Position: LHP

Height: 6’1″

Weight: 190 pounds

School: Florida State

FOF Big Board Rank: third

Jamie Arnold is a 6’1”, 190-pound left-handed pitcher who plays for the Florida State University Seminoles. Arnold is arguably the most polished pitching prospect in the 2025 MLB Draft class. He has been dominant over the past two seasons and should be a very early draft pick.

Arnold was a blue-chip prospect coming out of high school at Jesuit High School in Tampa, Florida. On Perfect Game, Arnold was the 259th-ranked prospect and the 34th-ranked left-handed pitcher in the Class of 2022. Arnold went undrafted and honored his commitment to Florida State.

In his freshman season, Arnold was mostly used as a bullpen arm but would also get some midweek starts. Arnold made 24 appearances and eight starts. He posted a 2-5 record with a 6.34 ERA, a .269 opponent batting average, and 49 strikeouts in 44 innings pitched.

In his sophomore season, Arnold had a major breakout. He helped lead a very talented Florida State roster to the College World Series semifinals. During the 2024 season, Arnold made nineteen appearances and eighteen starts in their weekend rotation. He posted an 11-3 record with a 2.98 ERA, 3.22 FIP, a .224 opponent batting average, 2.2 BB/9, and 159 strikeouts in 105 ⅔ innings pitched. He was named a First Team All-American on D1 Baseball, Perfect Game, NCBWA, and ABCA.

During this past season, Arnold continued to dominate on the mound. The Sunshine State native made fifteen starts and appearances for the Seminoles. Arnold posted an 8-2 record with a 2.98 ERA, 3.98 FIP, 1.06 WHIP, 2.9 BB/9, a .208 opponent batting average, and 119 strikeouts in 84 ⅔ innings pitched. He was named First Team All-ACC for the second consecutive season.

Arnold possesses a three-pitch mix including his fastball, slider, and changeup. His fastball sits in the mid-90s and tops out at 98 mph with 18-20 inches of run and gets plenty of swing-and-miss.

Arnold’s slider is arguably his best pitch. Due to his low arm slot, it has a ton of sweeping motion and generates whiffs from both sides of the plate. He locates his slider very well and likes to use it as his putaway pitch.

Arnold didn’t use a lot of his changeup at Florida State. He has some feel for the pitch and it gives right-handed batters something else to think about.

While Arnold isn’t likely to be the #1 pick, there is an expectation that he'll come off the board early. He is the fourth-ranked draft prospect on MLB Pipeline and the fifth-ranked prospect on Baseball America.

Strengths

• Polished pitcher on fast track to MLB
• Excellent movement on all pitches
• Generates plenty of swing-and-miss
• Power fastball
• Above-average command

Weaknesses

• Needs to develop his changeup
• Fastball command wavers later in outings

Pro Comparison: Ricky Tiedemann

Projection: Top 10 pick

Bottom Line

Jamie Arnold has a proven track record against talent-rich teams and seems very polished compared to the rest of the pitchers in this draft class. The southpaw pitcher could be a great option for the Marlins with their first-round pick, but it would be a surprise if he's available by the time they're on the clock.

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