MACK: Hot Arms - Alvaro Carrillo, Robert Stock, Henderson Hernandez, David Hurtado, Olmedo Barria, Leyvi Rodriquez

 

Period:  6/15-6/28

 

Alvaro Carrillo/DSL Orange – 1.67-WHIP, 3-IP, 3-K, 3-BB, 0-ER, 0.00

Alvaro Carrillo is a 21-year-old right-handed pitching prospect (born April 5, 2005, in Palo Negro, Venezuela) in the New York Mets organization. He signed as an international free agent with the Mets in July 2024 and has pitched exclusively in the Dominican Summer League (DSL Mets Orange).

He stands 6'4" and 175 lbs, with a projectable frame.

Career Stats

2024 (DSL): 7 G (0 GS), 1-0, 2.08 ERA, 8.2 IP, 8 K, 9 BB, 1.50 WHIP.

2025 (DSL): 14 G (4 GS), 3-1, 4.96 ERA, 32.2 IP, 33 K, 36 BB, 1.74 WHIP.

He shows strikeout ability (around 9-10 K/9 in small samples) but struggles with control and consistency, with a high walk rate.

As a DSL pitcher who has mixed starting and relief, he remains a low-level developmental arm with upside tied to his size and athleticism.

 

Period: 6/20-7/3

Robert Stock/Brooklyn – 0.47-WHIP, 6.1-IP, 8-K, 1-BB, 0-ER, 0.00-ERA

Robert Stock is a 36-year-old right-handed pitcher (born November 21, 1989) in the New York Mets organization.

He stands 6'1" and weighs 260 lbs, bats left, and throws right.

Stock was drafted by the St. Louis Cardinals in the 2nd round (2009) out of USC.

 He originally came up as a catcher before converting to pitching. He reached MLB with the San Diego Padres in 2018 and has had a journeyman career:

MLB teams: Padres (2018–19), Red Sox (2020, 2025), Cubs (2021), Mets (2021).

MLB stats (through 2025, 57 games/75.1 IP): 2–4 record, 4.90 ERA, 1.66 WHIP, 77 strikeouts, 44 walks. Mostly relief work with limited starts.

Best MLB stretch: Strong 2018 with the Padres (2.50 ERA in 39.2 IP as a reliever).

Other experience: KBO League with Doosan Bears (2022, 9–10, 3.60 ERA); various minor league and independent stops. He signed a minor-league deal with the Mets in late 2025 after a brief 2025 MLB appearance with Boston.

He is known for his durability in the minors, pitch development/analytics focus, and adaptability (including arm slot changes).

At age 36, he is a depth arm who has shown flashes but battled consistency and injuries.

Pitch Repertoire

Stock features a modern, multi-pitch arsenal with significant horizontal movement. He has evolved it over time, dropping his arm slot lower (into three-quarters/sidearm territory in recent years) to optimize his sinker and overall effectiveness. He uses pitch shaping, varying release points, and analytics heavily.

Key pitches (based on recent Statcast/BrooksBaseball/FanGraphs data):

Cutter (primary, often ~88–92 mph): High usage. Short horizontal break. Reliable for tunneling and weak contact.

Sinker (~93–95+ mph): Core pitch, especially after tweaks. Low spin, strong arm-side run (up to ~17–20 inches), near-zero vertical break. Excellent for ground balls and weak contact; he emphasizes "inefficient" spin for movement.

Four-seam Fastball (~94–97 mph): Used less as a primary but for elevation/ride. He has touched higher velocities in the past (triple digits earlier in career).

Sweeper/Slider (~80–84 mph): Big horizontal break (sweep up to ~17–19 inches). Strong whiff pitch, especially vs. righties. Varies between slider and true sweeper shapes.

Changeup (~78–86 mph): Used more vs. lefties for fade. Usage has varied; he has experimented with grips/slots.

Notable traits:

Big horizontal differentiation (sinker vs. sweeper can exceed 3 feet of movement).

Low arm slot enhances run on the sinker but can make lefties tougher (hence changeup/sweeper adjustments).

Good extension and varying arm angles/release points for deception.

In 2025 Triple-A, he showed solid strikeout ability and ground-ball tendencies with this mix, though MLB command has been inconsistent at times (career ~5.3 BB/9).

Stock is a classic late-career story of reinvention through data and mechanics.

 

Henderson Hernandez/DSL Blue – 0.50-WHIP, 4-IP, 3-K, BB, 0-ER, 0.00-ERA

Henderson Hernandez is a 19-year-old right-handed pitching prospect (born December 19, 2006, in Santo Domingo, Dominican Republic) in the New York Mets organization.

He stands 6'2" and weighs 182 lbs, and throws right-handed.

The Mets signed him as an international free agent to a minor-league contract in May 2025, and he has pitched for the DSL Mets Orange in the Dominican Summer League (Rookie level).

2025 Performance (DSL)Stats: 9 games (5 starts), 1-2 record, 5.01 ERA, 23.1 IP, 19 strikeouts, 1.33 WHIP.

He has shown some strikeout ability (around 7.3 K/9) but has also allowed runs and baserunners at a modest rate in limited innings. As a very recent signee in a complex/Rookie league, this is his professional debut season, so expect development-focused usage with room for growth.

Hernandez is a low-level prospect not yet ranked on major public top-30/40 lists for the Mets.

He has starter potential due to his size, athleticism, and pitchability, but he lacks high-end present velocity based on early reports.

 In one scouting note, he is described as an "advanced" 6-2 righty who commands a ~90 mph tailing fastball and a long, blunt sweeper. He profiles as a craftsman with starter traits, though velocity is not yet a standout tool.

Period:  6/15-6/28

 

Daviel Hurtado/Brooklyn – 0.42-WHIP, 12-IP, 14-K, ER, 0.75-ERA

Daviel Hurtado (full name: Daviel Hurtado Diaz) is a 21-year-old left-handed pitching prospect in the New York Mets organization (born January 26, 2005, in Havana, Cuba).

He stands 6'1" and weighs 166 lbs. He bats and throws left-handed.

Hurtado signed with the Mets as an international free agent on January 15, 2023, for a $640,000 bonus after leaving Cuba in 2022. He missed most or all of 2023 due to injury (including Tommy John surgery). He made his professional debut in 2024.

Minor League Career Stats (through mid-2026)He has progressed through the Mets' system with strong strikeout ability and improving command, though he had some early struggles and injuries.

2024 (FCL Mets, Rookie): 0-5, 6.32 ERA, 15.2 IP, 23 K, 10 BB (high walk rate in debut).

2025 (FCL + St. Lucie A): 1-2, 2.06 ERA, 65.2 IP, 75 K, solid improvement especially in the FCL (0.47 ERA).

Key 2026 notes: Promoted to High-A Brooklyn in late May. He represented Cuba in the 2026 World Baseball Classic. He has posted dominant performances, including multi-inning outings with high swing-and-miss totals and low hits allowed.

Repertoire

Hurtado mixes four pitches with good command and swing-and-miss potential from a three-quarters/slingy arm slot.

Four-seam Fastball (primary pitch, ~93-95 mph, up to 96): Average ride and moderate arm-side run from a high release point. Well-commanded; generates ground balls (~55% GB rate). Decent but not elite bat-misser on its own.

Slider (86-88 mph): Heavy gyro movement. Strong whiff tool (~14% swinging-strike rate) and ground-ball generator (~50% GB rate).

Curveball (78-80 mph): Heavy downer shape; effective complementary pitch with good depth.

Changeup: Rarely used (firm around mid-80s in some data); developmental pitch.

His fastball velocity sits in the low-to-mid 90s (touching 96), and he generates solid induced vertical break. The combination of stuff, command, and a high strikeout/low walk profile has drawn attention as a helium prospect in 2026.

Outlook

Hurtado is a high-upside lefty starter prospect who has taken a big step forward in 2026 with better health and command. He is not yet on most top-30 Mets prospect lists but is generating buzz for his performance at High-A. Continued development of his changeup and durability will be key as he climbs the ladder toward Double-A and potentially MLB in the coming years.

 

Olmedo Barria/DSL Orange – 0.71-WHIP, 7-IP, 8-K, BB, 1-ER, 1.29-ERA

Olmedo Elias Barria is a 19-year-old right-handed pitching prospect in the New York Mets organization (born December 7, 2006, in Chepo, Panama).

He stands 6'4" and weighs 190 lbs, with a right-right batting/throwing profile.

The Mets signed him as an international free agent (UDFA) on January 15, 2025. He has dealt with some injury time (60-day IL stint in 2025) but has pitched in the Dominican Summer League (DSL) for the Mets affiliates.

He has primarily worked in relief so far (no starts listed) and shows promising command and swing-and-miss stuff in limited innings.

At his size (projectable 6'4" frame), he is the type of arm organizations target for velocity and development.

He remains a developmental prospect to watch in the Mets' system.

 

Leyvi Rodriguez/DSL Blue – 1.00-WHIP, 5-IP, 7-K, 2-BB, ER, 1.80-ERA

Leyvi (Leyvi Manuel) Rodriguez is a 20-year-old right-handed pitching prospect in the New York Mets system (born May 17, 2006, in Yaguate, Dominican Republic).

He signed as an international free agent in January 2024 and has pitched exclusively in the Dominican Summer League (DSL) for the Mets.

6'2", ~195 lbs; righty thrower/batter.

Career MiLB (through 2026): Struggled with high ERAs (career ~7.7-8.8 range in limited DSL sample), high walk rates, but has shown strikeout ability.

In 2024 (age 18): 6.52 ERA in 29 IP with more strikeouts than innings.

2025 was rougher with elevated hits and walks.

He’s a lower-level developmental arm still working to refine consistency. Walk rates have been high (often 10+ BB/9 early on), but he generates swings-and-misses.

As of 2026, he’s shown some improvement in the DSL.

Overall Outlook: Rodriguez is a lottery-ticket type prospect—athletic with projection left in his frame and arsenal. He’s not on major top-30 Mets prospect lists yet and needs to cut walks while building innings. Continued strong DSL performance could push him toward the FCL or Low-A in 2027.