Scouting Report
Updated May 20, 2026
Juan Valera, a 19-year-old Red Sox RHP prospect, underwent Tommy John surgery in May 2026 after suffering an elbow injury during his third start of the season with High-A Greenville. The injury marks the second consecutive season he has dealt with elbow issues (missed 3 months in 2025 with elbow soreness). Prior to surgery, Valera was off to an impressive start, posting a 1.93 ERA with 17 strikeouts over 9.1 innings in three starts. He was recently added to Baseball America's Top 100 Prospects list and is ranked as Boston's No. 4 prospect. MLB.com scouts have suggested a potential future as a closer due to his durability concerns as a starter.
Strengths
- + Impressive early 2026 performance (1.93 ERA, 17 K in 9.1 IP)
- + High velocity fastball (96-98 mph, touches 101.7 mph)
- + Quality secondary pitches (slider, sweeper, changeup)
- + Recently added to Baseball America Top 100 Prospects
- + Ranked No. 4 prospect in Red Sox organization
- + Strong strikeout rate (17 K in 36 batters faced)
- + Excellent control early in season (4 walks in 9.1 IP)
- + Potential closer profile with elite fastball-slider combination
Weaknesses
- - Tommy John surgery required (May 2026)
- - Second consecutive season with elbow injury
- - Missed 3 months in 2025 with elbow soreness
- - Limited professional innings (138 total)
- - Recurring injury pattern raises durability concerns
- - Will miss remainder of 2026 season and likely into 2027
- - Health concerns may force organizational shift to bullpen role
- - Young age (19) with significant injury history
Injury Status: IL-60
About
Juan Guerrero is a shortstop for the Chicago Cubs.
Player Overview
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Chicago Cubs