Scouting Report: Riley Mahan
Milwaukee Brewers | 2B
Overall
Summary
Riley O'Brien is a 31-year-old relief pitcher for the St. Louis Cardinals who has emerged as an unlikely bullpen breakout success story in 2026. Originally drafted by Tampa Bay in 2017 and traded through multiple organizations, O'Brien joined the Cardinals in November 2023. After showing improved strikeout rates and walk rates in 2024, he has become one of the most productive relievers in baseball this season. His elite stuff features a 98.3 mph sinker with above-average movement and a sweeper with unique characteristics. O'Brien has stabilized the Cardinals' bullpen and is being considered as a potential closer option for the team.
Strengths
- Late-blooming pitcher with elite strikeout rate
- Significantly improved K%-BB% ratio
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