Kenley Jansen to Miss Red Sox Series in Colorado Due to Heart Condition

The closer has a history of atrial fibrillation and has experienced health issues at high altitudes.

Jansen will not travel to Colorado to avoid health risks associated with the high altitude.
He has previously needed medical intervention for his heart after games in Colorado in 2012, 2018, and 2022.
Despite recent struggles, Jansen remains a key player with 19 saves this season.
The Red Sox will face the Rockies with one less player on their 26-man roster.
Jansen is expected to rejoin the team for their series against the Yankees in Boston.