Cubs prospect Brett Jackson “has completely overhauled his swing”

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Cubs outfielder Brett Jackson ranked among Baseball America‘s top 100 prospects in 2010, 2011, and 2012, but the big knock against him was a very high strikeout rate and questions about whether he’d be able to hit for a decent batting average in the majors.

This year Jackson showed very good power at Triple-A, but hit just .256 with 158 strikeouts in 106 games and then struggled mightily with the Cubs, whiffing in 59 of his 120 at-bats.

Carrie Muskat of MLB.com reports that Jackson “has completely overhauled his swing” this offseason in an effort to cut down on the strikeouts, working with manager Dale Sveum and various Cubs coaches.

“I think he’s got a good base to work with going into the rest of the winter and going into spring training to understand the art of hitting, so to speak,” Sveum told Muskat. “Sometimes it gets lost and taught the wrong way.”

Obviously if Jackson can cut down on his strikeouts while not losing the other skills that made him a top prospect in the first place that would be great for the Cubs, but it’ll be interesting to see if having a 23-year-old “overhaul” his swing leads to unintended changes that hurt him overall.

Dave Martinez undergoes cardiac catheterization, return date unknown

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Nationals manager Dave Martinez left the team in the sixth inning of Sunday’s 7-0 win over the Braves to go to the hospital as a precautionary measure, Todd Dybas of NBC Sports Washington reported. Bench coach Chip Hale took over as manager for the remainder of the game.

Per Jesse Dougherty of the Washington Post, GM Mike Rizzo said Martinez felt chest pains and underwent a cardiac catheterization today. The procedure assesses the heart’s condition. The team doesn’t know yet when Martinez will return.

With Hale continuing to fill in as manager, Tim Bogar will act as the bench coach in place of Hale and Joe Dillon will coach first base in place of Bogar.

The Nationals enter play Monday leading the first NL Wild Card by 1.5 games over the Cubs. The Nationals open up a six-game road trip with three games against the Cardinals starting Monday night. Stephen Strasburg will oppose Dakota Hudson.