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Walker has been out of the Cardinals' lineup the last two games in order to work on his swing, Derrick Goold of the St. Louis Post-Dispatch reports.
Specifically, the Cards are working with Walker on getting the ball in the air. The 20-year-old has a hard-hit rate in the 78th percentile and max exit velocity in the 96th percentile, but his groundball rate is over 60 percent. "This is a guy who hits the ball at the top of the league, so if he learns how to get it off the ground there are a lot of extra-base hits and homers awaiting him," manager Oli Marmol said. The Cardinals have a boatload of outfield options right now and it's unclear whether he will be back in the lineup Wednesday.
