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Miles Mastrobuoni

Seattle Mariners | 3B

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Scouting Report

Updated May 19, 2026

Spencer Miles, a 25-year-old Rule 5 pick for the Toronto Blue Jays, is being given a significant opportunity to pitch in a bulk role (either as a starter or behind an opener) while the team's primary starters Shane Bieber and Max Scherzer recover from injuries. Miles recently threw a season-high 3.2 innings and 56 pitches against the Detroit Tigers on Saturday, May 16, 2026. Manager John Schneider emphasized the importance of consistency in Miles' role to avoid moving him back and forth between positions.

Strengths

  • + Receiving significant opportunity in bulk role during injury crisis
  • + Recently threw season-high 3.2 innings showing increased workload capacity
  • + Young age (25) with potential for development
  • + Rule 5 pick status indicates organizational confidence
  • + Manager emphasizing consistency in role assignment

Weaknesses

  • - Limited track record at MLB level
  • - Filling in for injured starters suggests he may not be the long-term solution
  • - Workload management concerns with increased innings
  • - Competing against established starters for rotation spot once they return

About

Miles Mastrobuoni is a third baseman for the Seattle Mariners.

Player Overview

Position

3B

Team

Seattle Mariners