GOODYEAR, Ariz. — Right before the start of spring training, Cincinnati prospect Nick Senzel received a phone call at his home in Knoxville, Tenn. It was from Reds headquarters. The club had a question for its top rookie-eligible player: could he handle shortstop?
“I said, ‘Yeah,’” Senzel told FanGraphs recently in Arizona. “And they got me there now.”
Even before taking the call, the No. 2 pick of the 2016 June draft was taking ground balls at third, second, and shortstop — and even fly balls in the outfield — on the playing surface of Lindsey Nelson Stadium, the baseball home of his alma mater, the University of Tennessee. A third baseman in college, Senzel wanted to make himself as versatile as possible entering this season.
It was prescient planning, as the Reds have since begun one of the great experiments of the spring.
As players advance through professional baseball, as they age at the major-league level, they typically move down the defensive spectrum. What is so interesting about Senzel playing shortstop, even if it’s short-lived, is that it represntns a case of a player moving up the spectrum.
There is an argument to be made that more teams should be identifying players who can move to more challenging positions. Why? Because over the last decade, about 20% of defensive opportunities — as in batted balls in play — have evaporated. In this three-true-outcomes environment, it’s easier to hide a bat, to trade some glove for bat, when the ball is less of a threat to reach the field of play.
There were 60,249 “plays” by defenders in 2007, according to FanGraphs data. Last season, there were just 49,809 — or roughly 10,000 fewer.
Consider opportunity trends by position:


It’s not just Senzel. Paul DeJong, who appeared at a variety of positions during his junior campaign at Illinois State, received over half the Cardinals’ starts at shortstop last season. Lonnie Chisenhall and Jason Kipnis were deployed in center at times in 2017, aided by a staff that recorded the highest strikeout rate of all time. Dee Gordon is transitioning to center field in Seattle.
Could it work? Could teams benefit from more aggressive defensive assignments? Could it be the next big thing? Or at least a little thing at no cost to clubs ever in search of efficiency and hidden value?
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Senzel believes he can stick at short and has ambitions to make the team as the club’s starter out of spring training, although the realities of how clubs manipulate service time make that all but impossible. Still, Senzel reported early to camp. He’s worked with Barry Larkin. He’s participated every day in a particular drill where rubber balls are thrown off a wall, forcing Senzel to quickly reset his feet and transfer the ball into throwing positions.
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