Carson Kelly -- Prospect Evaluation

Carson Kelly was drafted in the 2nd round of 2012 by the St. Louis Cardinals as a high school shortstop and pitcher from the Pacific Northwest. Signing scout Matt Swanson first identified Kelly during the summer before his draft year, recognizing him as a high-profile Team USA player. Swanson observed Kelly multiple times during the spring, noting the challenging weather conditions in the northwest during that period.

Upon turning professional, Kelly transitioned to third base before moving behind the plate in 2014, where he quickly demonstrated significant promise. He was ranked twice among Baseball America's Top 100 prospects. However, blocked by established Cardinals catcher Yadier Molina, Kelly was traded to the Arizona Diamondbacks in December 2018 as part of the Paul Goldschmidt deal.

In his first full MLB season with Arizona, Kelly produced solid numbers, batting .248 with a .348 on-base percentage, .478 slugging percentage, and 18 home runs. The retrospective captures Swanson's perspective on identifying and developing a prospect who successfully navigated positional changes and eventually established himself as a regular MLB player.

Carson Kelly ranks #3 among St. Louis Cardinals prospects as the highest-rated positional player in their system due to positional scarcity and value. The 6'2", 220-pound catcher was originally drafted in the second round in 2012 and spent 2017 between Memphis (Triple-A) and St. Louis. His primary value derives from elite defensive capabilities at catcher, a position notoriously difficult to fill in baseball. Kelly moves well behind the plate with excellent form on blocking balls and demonstrated strong throwing ability. Offensively, Kelly maintained a sub-15% strikeout rate throughout most of his minor league career but previously struggled with power production and quality of contact. His 2017 campaign marked a significant turning point, posting a .283/.375/.459 slash line with a 120 wRC+ at Memphis. While scouts don't project him to become a slugger, his frame finally began delivering power results, with evaluations expecting him to produce approximately 15 home runs annually with a 100-105 wRC+ as a full-time player. The combination of potentially average offensive output paired with plus defense at a premium position makes Kelly an exceptionally valuable prospect despite the existence of other position players in the system some evaluators prefer.

Matt Swanson, the St. Louis Cardinals scout who signed Carson Kelly in the second round of the 2012 MLB draft, recently reflected on what made Kelly stand out among hundreds of prospects. Beyond Kelly's athletic versatility—which Swanson envisioned could translate to success as a power-hitting third baseman, defensive catcher, or pitcher—Swanson was most impressed by Kelly's exceptional intelligence and mental makeup. At just 17-18 years old, Kelly distinguished himself by independently carrying conversations with scouts, a rare quality among young prospects where parents typically lead discussions. Swanson described Kelly as "one of my absolutely favorite kids that I got to meet with," citing an "unbelievable family dynamic and support with a competitiveness amongst them and just pure humility." Kelly eventually developed into a budding star catcher for the Arizona Diamondbacks after progressing through the Cardinals system.

Carson Kelly is a right-handed catcher/position player drafted 86th overall in 2012 by the St. Louis Cardinals from Westview High School in Oregon. At 6'2" and 212 lbs, Kelly possesses a strong build with solid tools across the board. As a hitter, he demonstrates a line-drive stroke with good loft and power potential, though he is a below-average runner. Defensively, he is a steady performer behind the plate with a strong arm and was consistently rated as the best defensive catcher in his organization. As a two-way prospect, Kelly also pitched in the 90-92 mph range with curveball and changeup offerings, though scouts generally preferred his position player upside.

Kelly progressed through the Cardinals' minor league system from 2013-2018, ranking as high as #3 prospect in 2018 before being traded to Arizona. He was ranked #55 by Baseball America in 2018 and #65 in 2017. Throughout his minor league tenure, he appeared on various league prospect lists, including #7 in the Pacific Coast League (2017), #11 in both the Arizona Fall League and Texas League (2016), and #5 in the New York-Penn League (2013). His career has included transactions with multiple organizations: the Chicago Cubs signed him as a free agent, he was acquired by Detroit from Arizona, and subsequently traded to Texas Rangers before returning to Chicago Cubs organization.

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