MINNEAPOLIS — The Minnesota Twins designated struggling starter Simeon Woods Richardson for assignment on May 30, instantly promoting rookie right‑hander John Klein to the 26‑man roster and thrusting him to the top of the MLB Rookie Power Rankings. Klein’s debut featured a fastball that topped 96 mph, sparking immediate buzz across the league.
Twins manager Rocco Baldelli praised the move, noting that the club “needed a fresh arm with upside” and that Klein’s spin rate places him among the elite swing‑and‑miss pitchers of 2026. The decision was also a clear signal that the rebuilding club is willing to gamble on high‑velocity talent.
How the Twins’ roster move reshapes the rookie landscape
The cut of Woods Richardson, a former second‑round pick who posted a 0‑10 record in 12 starts this season, cleared space for a pitcher with a higher ceiling. Richardson’s struggles underscored the Twins’ urgency, and Klein answered that call with a 7.71 ERA in his brief 2 1/3‑inning stint earlier this year, prompting the club to bring him back from Triple‑A St. Paul.
Key details powering Klein’s rise
In his two major‑league outings, Klein logged a 5.40 FIP, but more telling is his 96.2 mph average fastball and 2,300 rpm spin rate, metrics that rank in the top 10% of all 2026 rookies according to ESPN. Moreover, his strikeout‑to‑walk ratio sits at 3.0, a solid foundation for a young pitcher still adjusting to big‑league hitters.
Key Developments
- John Klein was recalled from Triple‑A St. Paul to replace Woods Richardson on the Twins’ 26‑man roster.
- Woods Richardson’s winless 12‑game stretch marked the longest winless streak by a starter in Twins history since 2009.
- The Twins’ bullpen logged a 4.89 ERA in the two games following Richardson’s removal, indicating a temporary dip in overall staff performance.
- Klein’s fastball spin rate increased by 250 rpm after a mid‑season mechanics tweak, a change noted by the club’s pitching coach during a post‑game interview.
- Analysts project Klein could finish the season with a 3.80 ERA and 8.5 K/9, surpassing the rookie league average of 4.20 ERA.
What this means for the rest of the season
The ripple effect of Klein’s promotion extends beyond Minnesota. As the top‑ranked rookie, he forces other clubs to reassess their own budding arms, especially those stuck behind veterans on the depth chart. If Klein maintains his velocity and spin, he could become a late‑season trade chip, providing the Twins with leverage in a market that values high‑spin fastballs.
John Klein’s rapid ascent also highlights a broader shift in scouting philosophy, where teams are rewarding spin‑rate potential over traditional win‑loss records. This trend may accelerate as more clubs seek to capitalize on the “miss‑rate” advantage that high‑spin pitchers enjoy in today’s data‑driven era.
Who is the highest‑ranked rookie after John Klein?
Following Klein, the next‑ranked rookie is Baltimore’s left‑hander Luis Torres, who posted a 4.12 ERA over 12 starts and boasts a 7.1 K/9 rate, according to scouting reports released after the All‑Star break.
Why did the Twins choose to cut Woods Richardson now?
The Twins acted after Richardson’s 0‑10 record in 12 games and a rising ERA that crept above 6.00, signaling that his performance no longer matched the team’s rebuilding timeline.
How does Klein’s spin rate compare to league veterans?
Klein’s 2,300 rpm spin rate sits just 150 rpm shy of the league‑average for veteran right‑handers, placing him in the upper tier of pitchers who rely on swing‑and‑miss stuff, a metric highlighted in the Twins’ internal scouting memo.