The Minnesota Twins recently signed Willi Castro to a minor league contract. He will not be the opening day shortstop, he likely won’t make the team, and in a perfect world, he probably never sees the Big Leagues in 2023. Having experienced a very not perfect 2022, Castro provides depth in several positions and has some intriguing skills worth noting. While digging, I found some interesting things about Castro that I would like to share and found him a more familiar player than I initially thought. 

Feature Image via Tom Hagerty

So far in his career, Willi Castro has not been a very productive Major League Baseball player. Through just over 300 games and 1,000 plate appearances, he is slashing .245/.292/.381 (.673 OPS) with a 4.7% BB%, 24.1% K%, 86 wRC+, and -22 total DRS (defensive runs saved) at six different positions through 2,338 innings and 1.6 fWAR. Not to be redundant, but he has been relatively unimpressive so far, hence why he was DFA’d from the Detroit Tigers and could only land a minor league contract. 

So why would the Twins invest? For starters, minor league contracts carry almost zero risk, meaning if the Twins cut him halfway through the season, there are no negative consequences. Castro is a switch hitter who has been significantly better against left-handed pitching (career .711 OPS vs. LHP - .658 OPS vs. RHP). The Twins have been searching for more effective bats against left-handed pitchers, and he has Major League experience at six positions: 2B, SS, 3B, and all three outfield spots. In addition, Castro also has some eye-catching athleticism metrics. Per Statcast, his max exit velocity for his career is 115.4 MPH, which was the 95th percentile in 2021. Statcast registered his sprint speed in 2022 as the 78th percentile, and his arm strength scored in the 87th percentile, with his hardest throw hitting 97.0 MPH. 

Can you think of any Twins players that sound familiar to Willi Castro? 

The player that came to my mind is Danny Santana. Both players entered the Big Leagues with a bang, but their teams eventually moved on after both players failed to repeat their hot start. Santana bounced around in the Minor Leagues and resurfaced as a utility man with another breakout season in 2019 but was largely unproductive outside 2014 and 2019. Castro was exceptional in 2020 but has been relatively unproductive since and is following Santana’s footsteps by trying to survive in the Majors as a utility man. He logged about 800 more plate appearances than Castro, but their career numbers are similar in certain areas. 

Here are some statistics that are very close for Castro and Santana:

(Castro)  (Santana) 

OBP: .292  .296

BB%: 4.7%  4.8%

K%: 24.1%  25.6%

wRC+: 86  85

xwOBA (League avg .316): .296  .290

Z-Swing % (League avg 66.9%): 75.0%  74.5% 

O-Swing% % (League avg 28.4%): 39.8%  36.9%

Swing % (League avg 47.1%): 56.7%  55.3%

Whiff % (League avg 24.7%): 29.2%  29.7%

DRS at SS: -13 (696 Innings)  -15 (918 Innings)

Sprint Speed: 78th percentile (2022)  74th percentile (2021) 

Arm Strength: 87th percentile (2022)  96th percentile (2021)

What stands out about these numbers? The similarities between the two players are plate discipline and bat-to-ball ability. These players are free-swinging, low-walk, medium strikeout hitters with good raw power that hasn’t entirely translated into game power, likely due to plate discipline or approach reasons. They also compare similarly as athletes and defensively at shortstop. 

So how do they differ as players? Castro and Santana utilize their athleticism quite differently. Santana, throughout his career, has two different 20 stolen base seasons and has a 75/101 (74.3% success rate); Castro has only stolen 18 bases and is 18/28 (64.2% success rate) in his career. Santana also hit for a little more power than Castro has so far; Santana’s career SLG is .413, Castro at .381 with ISO (SLG minus BA, league avg .183) saying the same; Santana at .159 and Castro at .136. Castro has had his athletic abilities translate more to the defensive side of the ball. While neither player stuck at SS, Willi Castro has turned himself into a viable defensive option in the outfield, something Santana never quite got to. DRS (0), UZR (0.1), and OAA (-1) all agree that through 724 innings, Castro is about a league-average outfielder. They are less conclusive on Santana but overall are low, totaling 1945 innings, with DRS having him at -7, UZR at -1.1, and OAA at 1. 

This move by the Twins carries a negative undertone due to how the offseason has been going so far but try not to let their failure in one area (or player) affect your judgment of Castro. He has some very tantalizing physical tools as well as spurts of success in the Major Leagues, not to mention Detroit is one of the most pitcher-friendly parks in all of baseball. A deal with this kind of upside on a minor league contract is good for the Twins. While praising this signing seems contradictory because ideally, he never leaves St. Paul, we will likely see Castro at some point due to his versatility and the inevitability of injuries. Whether or not you are a fan of this move, I hope this nugget was interesting to you in some manner and I look forward to reading your thoughts on Willi Castro.

Links and Definitions for some lesser known statistics: 

xwOBA: https://www.mlb.com/glossary/statcast/expected-woba

wRC+:https://www.mlb.com/glossary/advanced-stats/weighted-runs-created-plus

Z-Swing%, O-Swing%: https://library.fangraphs.com/offense/plate-discipline/

Whiff %: total swings and misses/total swings 

DRS: https://library.fangraphs.com/defense/drs/

UZR:https://library.fangraphs.com/defense/uzr/

OAA:https://www.mlb.com/glossary/statcast/outs-above-average