The Mariners recently invited their players to a bat-fitting session. They hired a private company to run players through motion-capture technology to find what size, shape and weight of bats best fit their swing movements. The star of the show was the second-worst hitter ever with at least 550 plate appearances.
Mariners outfielder Jarred Kelenic is a career .168 hitter. Only John Vukovich (.161) was worse with that many times at bat in the big leagues. Vukovich was a journeyman utility infielder who played 277 games over 10 seasons. Kelenic is 23 years old and only two years ago was ranked ahead of Julio Rodríguez as the fourth-best prospect in baseball. Mariners hitting coach Jarret DeHart said the motion-capture results graded Kelenic’s swing “off the charts” in terms of efficiency.
“Kelenic made some significant swing adjustments,” DeHart says. “As we did our bat fitting, we were checking on some of the adjustments we made with him last season and some things we were hoping to address with him. He addressed everything we asked of him, just in terms of his body working more efficiently.”
