Jameson Taillon’s Hamstring Strain Ends Cubs’ Start Against Giants

On Sunday, Chicago Cubs starter Jameson Taillon left the game against the San Francisco Giants in the top of the second inning after feeling a left hamstring strain. The injury occurred after he delivered ball four to Giants third baseman Matt Chapman. Taillon called for the athletic trainer, was replaced by right-hander Javier Assad, and will undergo an MRI on Monday to assess the severity.

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Taillon, 34, has started all 13 of the Cubs’ games this season. He holds a 5.19 earned-run average and leads Major League Baseball in home runs allowed, with 20 surrendered to opposing batters. In the game against San Francisco, he gave up a run in the first inning before exiting. The Cubs ultimately lost 2–1 in ten innings.

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Taillon’s placement on the injured list removes a veteran arm from the rotation and creates an immediate vacancy. Javier Assad, who entered in relief, shut out the Giants for 6 1/3 innings, positioning him as a potential rotation candidate. The Cubs also anticipate the return of right-hander Matthew Boyd, who is scheduled to rejoin the staff after two rehab outings at Triple-A Iowa. The injury adds to a broader pattern of pitcher ailments affecting Chicago’s staff.

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The Cubs’ pitching corps has faced multiple setbacks this season. Left-hander Cade Horton is dealing with an elbow issue, while right-hander Justin Steele is sidelined with an elbow injury. Matthew Boyd is recovering from a knee problem, and right-hander Edward Cabrera recently returned from a blister injury after taking the loss in an 18–3 defeat to the Giants. These concurrent injuries have limited the team’s depth.

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Chicago’s front office confirmed that Taillon will be placed on the injured list and will receive an MRI to determine the appropriate recovery timeline. The organization emphasized that the move is intended to protect the pitcher’s health and to allow the rotation to adjust. Team officials noted that Assad’s effective relief work provides flexibility while the staff monitors Boyd’s progress for a possible return.

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• “It's nothing I've ever felt,” — Jameson Taillon, Cubs pitcher

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• “Unfortunately, one pitch kind of did it.” — Jameson Taillon

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• “I don't think it's crazy,” — Jameson Taillon

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• “I'm walking around, moving around.” — Jameson Taillon

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• “Hopefully we can keep the arm conditioned and moving around and limit it from being too long.” — Jameson Taillon

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Taillon’s MRI is scheduled for Monday, after which the Cubs will determine the length of his IL stint. In the interim, Javier Assad is expected to receive spot starts, and the club will evaluate the timing of Matthew Boyd’s activation to stabilize the rotation for the remainder of the season.

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