MACK - Let's Get to Know - RHP - Aiden Keenan

 

The Mets promoted RHP Aiden Keenan from FCL-Mets to A-St. Lucie.

Aidan Keenan is a right-handed pitcher in the New York Mets organization, selected in the 7th round (210th overall) of the 2026 MLB Draft out of Stanford University.

mlb.com

Background and Amateur Career

• Born: March 7, 2005 (age 21 as of mid-2026); from Morgan Hill, Ca.
• Physical: 6'2", 202 lbs; bats/throws right.
• High school: Live Oak HS (Morgan Hill, CA). Strong senior year (2023): 0.74 ERA, 0.79 WHIP, 75 K in 47 IP. League Pitcher of the Year, team MVP, and other honors. Ranked among California’s top RHPs (around No. 4 in state by Perfect Game). He had draft interest as a prep but honored a strong Stanford commitment and did not sign in 2023. Also played basketball and football.
  gostanford.com
• Family: Older brother Tyler was a 4th-round pick by the Mariners in 2020 out of Ole Miss.
• College (Stanford Cardinal):
  • Freshman (2024): Limited role — 5 appearances (2 starts), 6.75 ERA, 6.2 IP, 7 K, 10 BB.
  • Sophomore (2025): Primarily a reliever — team-high 24 appearances, 2-3 record, 5 saves (team-best), 5.59 ERA, 37 IP, 43 K, 14 BB. ACC All-Academic Team.
  • Junior (2026): Moved into the rotation but limited by an oblique injury in mid-March. 7 appearances (6 starts), 1-3, 5.82 ERA, 21.2 IP, 25 K, 21 BB. Appeared in a couple of Cape Cod League games for the Falmouth Commodores afterward.
    amazinavenue.com
• Career college totals: roughly 65.1 IP, 5.79 ERA, 75 K, 45 BB across 36 appearances (8 starts).

He signed with the Mets for approximately $347,500–$350k (above the ~$287.8k slot value). He was assigned to the FCL Mets, then to Low-A St. Lucie Mets (as of late August 2026). In his pro debut for St. Lucie, he threw a scoreless inning with 1 K and a fastball that touched ~96.6–97.2 mph.

spotrac.com

Pitching Repertoire and Scouting ProfileKeenan throws from a low three-quarters arm slot with a high-tempo delivery that has some effort. He generates velocity via a powerful stride and torque. Profile notes big velocity and spin rates, lower innings mileage (no major arm injuries reported in college), and some control/command concerns—especially when tiring. He showed better walk rates in the 2025 relief role (~8.8% BB%) than as a starter. Scouts see a potential starter if command improves, but many view a higher-leverage reliever ceiling due to the walk issues and delivery. Ranked around No. 345–346 by Baseball America pre-draft. 

@OCBaseball814

Main pitches:

• Fastball: Mid-90s (sits ~94–96), touches 98–99 mph (and ~97 in early pro work). Features riding life/explosion; potential plus offering but command is the limiter.
• Sweeping slider / sweeper: Mid-80s, high-spin. Best secondary; tight vertical drop + strong horizontal movement. Primary out-pitch.
• Cutter: High-80s with tighter horizontal action; used to induce weak contact.
• Changeup: Developing; two variants reported (high-80s circle change with run; low-80s split-change with more drop). Used sparingly in games so far.

Overall, it’s a four-pitch mix with power stuff highlighted by the fastball-slider combination. Command/control and secondary consistency (especially the changeup) are the main developmental focuses in the minors.

amazinavenue.com

He’s a high-upside arm with big velocity and spin in the Mets’ lower minors, still very early in his pro career as of August 2026.