BP Daily: Ranking the breakout hitters
D'Backs, Nationals and Reds dominate list of potential stars
Not every top prospect hits the ground running the way recent Rookie of the Year winners like Evan Longoria and Ryan Braun did, stepping into a major league lineup and putting up All-Star caliber numbers. Sometimes it takes a couple of years' worth of experience and adjustments for a high-upside player to reach his potential, but when he does, look out.
Our PECOTA projection system can help to identify such players via a trio of categories called "breakout," "improve" and "decline," which estimate the likelihood of a player's production significantly rising or falling relative to his established baseline level. "Breakout rate" is the percent chance that a hitter's equivalent runs produced per plate appearance will improve by at least 20 percent relative to the weighted average of his performance over the past three years. A high rate generally indicates a high upside, though it's worth noting the Ugueto Effect, in which the system will estimate a high rate for a horrible player simply because there's nowhere else for him to go.
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