Carter Kieboom likely to miss Opening Day with forearm injury

Nationals third baseman Carter Kieboom underwent an MRI on his sore throwing elbow today that revealed a flexor mass strain in his right forearm, manager Davey Martinez told MLB.com’s Jessica Camerato and other reporters.  It isn’t clear how much time Kieboom will miss, as the 24-year-old is continuing to undergo more tests.

Kieboom is entering his fourth MLB season, though the former 28th overall pick has yet to make an impact at the big league level.  Kieboom has hit only .197/.304/.285 in 414 plate appearances, making for an inauspicious start for a player who was considered one of the sport’s top 15 prospects heading into the 2020 season.

Of course, the unusual nature of both the 2020 and 2021 seasons surely haven’t helped Kieboom’s development, not to mention the simple fact that many players (even top prospects) take a while to adjust to the majors.  It is far too early for the Nats to give up on such a highly-touted youngster, even if Kieboom’s lack of power has now seemed to carry into his minor league numbers.  Kieboom hit only .237/.376/.385 over 181 PA at Triple-A last season, after posting much higher slugging percentages in his first four minor league seasons.

While Kieboom had some big shoes to fill as Anthony Rendon’s heir apparent at third base, Kieboom’s lack of production has limited his playing time, and now this injury will cost him at least some time at the start of the 2022 season.  Even if Kieboom is able to avoid a trip to the injured list, he’ll need some more time in the minors or in extended Spring Training to make up for the lost prep time, thus opening up a hole at the hot corner in Washington’s Opening Day lineup.

Barring a future transaction from the Nationals, Maikel Franco is probably the likeliest candidate to fill that spot.  Franco inked a minors deal with the District in December, as he was a minor league free agent and thus eligible to sign during the lockout.  A former top prospect himself on his way up the Phillies’ minor league ladder, Franco had a nice 2015 rookie season but has since hit .244/.294/.419 over 2792 PA with the Phillies, Royals, and Orioles.

Utilityman Ehire Adrianza could also get some third base time in the event of a Kieboom IL stint, and other minor league signings like Richard Urena or even Dee Strange-Gordon could potentially get some looks.  Top prospect Luis Garcia is being used only as a shortstop and second baseman during Spring Training, MASNsports.com’s Mark Zuckerman writes, and neither Garcia nor current starting shortstop Alcides Escobar seem like a third base candidate.