Heyward was injured in the defensive half of the third inning on a triple by Gerardo Parra. Heyward chased the ball into the corner and appeared to stumble as he threw the ball to the cutoff man. He was replaced by Jon Jay.
Heyward, 25, was acquired in an offseason trade with the Atlanta Braves. He has started all 16 of the Cardinals' games so far this season and is batting .214 with two home runs. He won a Gold Glove last season with the Braves and batted .271, his best average since his rookie season.
Heyward is the second notable Cardinals player to be injured this weekend. On Saturday, All-Star pitcher Adam Wainwright injured his Achilles tendon while running out of the batter's box. He was placed on the disabled list Sunday and the team reportedly fears he will miss the rest of the season.
- Dan Gartland