Mariners Closer Andrés Muñoz Left Game With Knee Injury
Seattle Mariners closer Andrés Muñoz is set to undergo medical imaging following a late-game injury.
Updated on Sept. 20, 2026 in Baseball
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Seattle Mariners closer Andrés Muñoz exited a matchup against the Colorado Rockies in the ninth inning after suffering a knee injury. The team confirmed that Muñoz will undergo medical imaging to determine the extent of the damage.
Why it matters
The injury creates immediate uncertainty for the Seattle Mariners as they assess the health of their key reliever in the final stretch of the season. With the team already mathematically nearly eliminated from playoff contention, the medical results will determine the club's approach for his remaining availability.
Muñoz posted a 4.11 ERA with 28 saves and 10 blown saves across his 2026 campaign. These figures are contrasted by a 3.06 fielding independent pitching metric recorded over 57 innings.
The players
Andrés Muñoz
He is a relief pitcher who served as the primary closer for the Seattle Mariners during the 2026 season.
Seattle Mariners
They are a professional baseball team based in Seattle that competes in the American League West.
Colorado Rockies
They are a professional baseball team based in Denver that competes in the National League West.
The details
Muñoz left the field in the ninth inning of the game against the Colorado Rockies due to the discomfort. The team announced plans for immediate diagnostic imaging to evaluate the player's knee.
Timeline
September 20, 2026: The injury occurred during a game against the Colorado Rockies.
September 21, 2026: Muñoz is scheduled to undergo medical imaging on his knee.
Season Trajectory
This injury marks a final hurdle for a Seattle Mariners roster that has faced significant struggles throughout the 2026 season. The bullpen is already expected to undergo a comprehensive makeover during the upcoming offseason to improve upon this year's results.
Fantasy managers and observers should monitor the medical imaging results to determine the team's closing hierarchy for the season's final games. The injury effectively sidelines the pitcher for immediate appearances while the team evaluates his long-term health.
The takeaway
The injury serves as a reminder of the volatility inherent in maintaining pitcher health throughout a full MLB season. Fans should look for official team updates on the imaging results to gauge the player's readiness for next year.
Further reading
For more updates on the roster, visit the Seattle Baseball section.
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