Kansas City, MO (Sports Network) - Mariano Rivera was injured during batting practice Thursday prior to the Yankees' game against the Kansas City Royals.
Rivera apparently injured his right knee while chasing fly balls in the outfield.
The 42-year-old has five saves and is 1-1 with a 2.16 earned run average in nine games for New York this season.
No word on the severity of Rivera's injury.
The Sports Network