MACK – Let’s Revisit - RHRP - Juan Arnaud

 

MACK – Let’s Revisit - Juan Arnaud

Juan Antonio Arnaud is a right-handed relief pitcher in the New York Mets’ minor league system (MLBAM ID 699304).

milb.com

Background and Profile

• Born: June 22, 2003, in Cotuí, Dominican Republic (age 23 as of 2026).
• Physical: 6'2", 164 lbs; bats/throws right.
• Signed: International free agent by the Mets on January 15, 2021.
• Primarily a reliever (only one career start in the minors). He has progressed through the DSL, FCL Mets, Low-A St. Lucie Mets, and High-A Brooklyn Cyclones. He also appeared briefly in the Dominican Winter League with Gigantes del Cibao.
  mlb.com

Career Path and PerformanceArnaud has shown strong strikeout ability but has battled control issues (elevated walk rates) that have slowed his climb.

• 2025 highlights: Excellent year in Low-A St. Lucie (6-2, 2.45 ERA in 29 appearances, 40.1 IP, 45 SO, improved BB rate). He earned Florida State League Pitcher of the Week (Aug. 4–10) after two hitless, scoreless appearances totaling 5 IP with 6 strikeouts. Late-season promotion to Brooklyn (High-A) saw a rough 8.59 ERA in limited action.

2026: A+/Brooklyn - 46-apps, 4-2, 2.79, 1.56, 51.2-IP, 39-BB, 74-K

• baseballsavant.mlb.com

He is not a high-profile Top 30 prospect but has been noted in broader system lists for his arm strength. Control (especially of the breaking ball) has been the main barrier to faster advancement.

blogs.fangraphs.com

RepertoirePublic scouting notes describe a power-oriented two-pitch mix typical of a potential high-leverage or middle-relief arm:

• Fastball: Sits 96 mph with sink; touches 99. The sinking action is a key trait.
  blogs.fangraphs.com
• Slider: Secondary pitch; command of it has been inconsistent and a noted developmental focus.

Detailed public pitch-tracking data (spin, movement profiles, usage percentages) is limited at the High-A level, so more granular arsenal breakdowns are not widely available. 

He profiles as a fly-ball/ground-ball mix with swing-and-miss potential when the fastball-slider combination is on.

Overall, Arnaud is a hard-throwing Dominican arm with strikeout upside whose path depends on refining command. He remains active in the Mets system as of the 2026 season.