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Scouting Report
Updated May 19, 2026
JB Middleton is a RHP prospect (No. 7 PuRP) for the Colorado Rockies currently on the Fresno Grizzlies. He was placed on the seven-day IL in early May 2026. Prior to injury, he posted a 4.95 ERA (1.70 WHIP) over 20.0 IP with 18 strikeouts, 3 home runs, and 13 walks. He showed promise with an excellent outing on April 11, 2025 (5 K, 1 R over 5 IP). In his final college season (2025), he compiled 105.1 IP with a 2.31 ERA, 122 strikeouts, and just 25 walks. He is focusing on pitch development as part of the Rockies' rebuild.
Strengths
- + Strong college performance with 2.31 ERA and 122 K in 105.1 IP
- + Excellent strikeout ability demonstrated in college and professional outings
- + Low walk rate in college (25 walks in 105.1 IP)
- + Confident approach and focus on pitch development
- + High prospect ranking (No. 7 PuRP)
Weaknesses
- - Currently on injured list (early May 2026)
- - High ERA (4.95) in early professional season
- - Elevated walk rate in professional ball (13 walks in 20 IP)
- - Allowing home runs at concerning rate (3 HR in 20 IP)
- - Transition from college to professional level showing struggles
Injury Status: IL-10
About
Keynan Middleton is a rp for the St Louis Cardinals.
Player Overview
RP
St Louis Cardinals