Nolan Arenado was slugging his way through the month of May when the Arizona Diamondbacks third baseman woke up one morning with an ailment that's familiar to those who felt invincible in their 20s but have advanced to their mid-to-late 30s. His back hurt. Not bad. Not enough to keep him out of the lineup. But it was one of those inexplicable moments that comes with being an aging Major League Baseball player — threatening to derail a hot streak for an eight-time All-Star who just turned 35. "There's more aches and pains," Arenado said. "There's just a little more work in the gym, getting prep...
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