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Another highly rated White Sox prospect will spend much of the next year in recovery mode.

Dane Dunning underwent Tommy John surgery Monday, the team told reporters in Arizona, pairing him with Michael Kopech as pitching prospects in recovery mode.

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Dunning was shut down last June because of a forearm issue, the White Sox hoping to avoid Tommy John at that time. He wasn't invited to big league camp this spring, with general manager Rick Hahn explaining that decision away as a way to ease Dunning into the 2019 campaign. But Dunning again experienced forearm discomfort during camp, and Hahn said last week that all options were on the table, including the Tommy John surgery that came Monday.

Dunning will presumably go through the standard recovery process following the surgery, which lasts many months. Kopech, the organization's top-rated pitching prospect, underwent the procedure not long after making his major league debut in late August, and he will not pitch in 2019.

The surgery is a tough turn of events for Dunning, who was putting together a terrific 2018 campaign when he was shut down last summer. He had a 2.71 ERA with 100 strikeouts in 86.1 innings between Class A Winston-Salem and Double-A Birmingham. Hahn spoke glowingly of Dunning, ranked by MLB Pipeline as the No. 80 prospect in the game, as someone who could've competed for a spot in the major league rotation this spring, if not for the injury.


Dunning becomes just the latest White Sox prospect to have a significant injury in the last couple seasons. Third baseman Jake Burger, the team's first-round pick in the 2017 draft, suffered a pair of Achilles tears last year and missed the entire season. Kopech will not pitch again until 2020 while he recovers from Tommy John surgery. Springtime injuries delayed the 2018 debuts of both pitcher Alec Hansen and outfielder Luis Robert until the summer. Outfielder Micker Adolfo is on the mend from Tommy John surgery, as well. Outfielder Luis Basabe suffered a broken bone in his hand this spring.

Individually, these injuries do little to dim the bright futures of the players. Even with time off to recover, their ceilings remain high. But both individually and collectively, they do figure to affect the timeline of the White Sox ongoing rebuilding project, thanks to missed developmental time. Enough players experiencing those delays on their path to the majors can add up to the team's planned contention window perhaps opening later than initially hoped.


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