Rivera's knee buckled when he fell awkwardly while chasing a fly ball at Kauffman Stadium during pregame warm-ups. Manager Joe Girardi and bullpen coach Mike Harkey ran over to assist the 12-time All-Star pitcher, who was taken off the field with his leg propped up. He was taken to a local hospital, and later reports said an MRI showed he suffered a torn ACL and a torn meniscus.
Rivera, 42, leads the league in saves, with 608 in his 18-year career. Before his injury, Rivera had indicated this might be his last season.