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Ignore the numbers, Mattingly says. Magneuris Sierra is ‘going to be good’

His batting average is poor. His on-base percentage is miniscule. And yet Marlins manager Don Mattingly sees a potential future star in rookie outfielder Magneuris Sierra.

“The kid’s going to be good,” Mattingly said. “He’s going to be a player.”

The numbers might not say so now. But Mattingly and others in the organization are still bullish on the 22-year-old outfielder they acquired from the Cardinals in the Marcell Ozuna deal last winter.

“It’s just a lack of experience,” Mattingly said. “They main thing for Mags is just to keep playing because he’s going to be a player.