Cubs righty Cade Horton exited today’s start after calling for a trainer in the second inning. The Chicago Tribune’s Meghan Montemurro points out that Horton’s final pitch was a fastball that clocked in about two miles per hour shy of his season average. Taylor McGregor of the Marquee Sports Network adds that the Cubs are calling Horton’s injury right forearm discomfort.

It’s an ominous development for a Cubs team that opened the season without ace Justin Steele, who is still on the mend from last April’s UCL surgery. Horton, 24, was the National League Rookie of the Year runner-up in 2025 after kicking down the door to the majors with a 2.67 ERA in his first 118 big league frames. The 2022 No. 7 overall pick’s 20.4% strikeout rate was a couple percentage points shy of average, but he offset that with strong command (6.9% walk rate), an average ground-ball rate (42.3%) and a knack for avoiding hard contact. He’s pitched 7 1/3 innings this season between his debut and today’s abbreviated start. Opponents have two runs on four hits and a walk.

Obviously, it’s too soon to say whether Horton will miss an extended period of time — if he misses any at all. Even a short-term IL stint would sting, however. The rest of the Chicago rotation includes Matthew Boyd, Jameson Taillon, Shota Imanaga and trade acquisition Edward Cabrera. Steele and former first-rounder Jordan Wicks are both on the injured list already.

Veteran swingman Colin Rea is in the bullpen and could start in the short term if the Cubs need. He filled in admirably last year when injuries piled up on the starting staff. Rea posted a 4.33 ERA in 27 starts last season and a 0.56 ERA in 16 relief innings. He was manager Craig Counsell‘s go-to option today as well, taking over after Horton’s exit. Righty Ben Brown worked as a starter in camp and is still stretched out for multiple innings as well; he’s tossed 6 2/3 frames in two appearances this season.

Looking further down the depth chart, righty Javier Assad is in Triple-A and already on the 40-man roster. He’s pitched to a 3.43 ERA in 331 major league innings, mostly out of the rotation, though injuries limited him to 55 1/3 innings between Triple-A and the big leagues last year. Top prospect Jaxon Wiggins is also in Triple-A but would need to be added to the 40-man roster. Veterans Kyle Wright and Vince Velasquez also opened the season with the Cubs’ top affiliate in Des Moines after signing minor league deals in the winter. Either could be called upon as short-term replacements, although like Wiggins, they’d need to be added to the 40-man roster.

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