Jonathan Cannon

The White Sox will promote right-hander Jonathan Cannon from Triple-A Charlotte to start Tuesday’s game, tweets Daryl Van Schouwen of the Chicago Sun-Times. He’s not on the 40-man roster, so they’ll need to formally select his contract and make a corresponding transaction to open a 40-man spot. It’ll be the big league debut for the 2022 third-rounder.

Listed at 6’6″ and 225 pounds, Cannon has been a fast riser through the South Siders’ system. The former Georgia Bulldog split the 2023 season between High-A and Double-A, and he was also on the roster for the 2023 Futures Game during last year’s All-Star festivities. He’s opened the 2024 campaign with 9 2/3 decent frames at the Triple-A level (three earned runs on ten hits and five walks with 11 punchouts). Baseball America ranks Cannon eighth among White Sox farmhands, while FanGraphs tabs him tenth in the system and MLB.com lists him 11th.

Cannon, 23, pitched 121 innings last season, working to a 4.46 ERA with a 20.5% strikeout rate, 7.5% walk rate and an impressive 53% ground-ball rate. Baseball America tabs him as a potential fourth/fifth starter, barring improvement to his command, which could further boost his ceiling. Their report on Cannon praises a deep arsenal (four-seamer, two-seamer, cutter, slider, curveball, changeup) that generates grounders and weak contact. Cannon sits 93-97 mph with his fastball, and scouting reports from BA, FanGraphs and MLB.com all call him a high-floor, high-probability fourth starter who can eat plenty of innings for the White Sox in the years to come.

It’s not clear yet how long Cannon or tonight’s starter, Nick Nastrini (another rookie who’s making his MLB debut) will stick in the rotation. Sox Machine’s James Fegan tweets that manager Pedro Grifol alluded to a potential bullpen move for struggling veteran Chris Flexen, but Grifol also didn’t commit to Nastrini or Cannon remaining in the mix beyond their debut efforts this week. Certainly, given the dismal results from the rotation thus far — Sox starters rank 26th in the big leagues with 72 1/3 innings pitched, 28th with a 5.60 ERA and dead last with a 5.20 FIP — an impressive debut for either pitcher could earn him another opportunity in the next trip through the rotation.

Beyond Garrett Crochet — who’s likely to be on an innings limit this season — there’s virtually no certainty in the Chicago rotation. Flexen, Erick Fedde and Michael Soroka opened the year in starting roles, but Flexen and Soroka are on cheap one-year deals and will be free agents at season’s end. Fedde’s two-year, $15MM contract after his KBO breakout gives him a longer leash, but he’s also not a long-term piece of the puzzle at Guaranteed Rate Field. The Sox will hope that between Cannon, Nastrini and other prospects like Jairo Iriarte, Jake Eder and Noah Schultz, the Sox have at least a few long-term rotation pieces who can help to quickly usher them out of the team’s latest rebuilding phase.