The 29-year-old Cespedes has hit .293/.323/.506 with 18 home runs and a 125 wRC+. He has been in the big leagues since 2012 and spent two-and-a-half seasons with the A's before they traded him to the Red Sox. Boston dealt him to the Tigers in the offseason. For his career, Cespedes is a .269/.317/.473 hitter with a 117 wRC+. The on-base percentage isn't stellar, but the power numbers are. His contract is up at the end of the season, at which time he must be made a free agent despite only having four years of major league service time.
If you watched the home run derby at Citi Field a couple years ago, you'll certainly remember the awesome display Cespedes put on that night. That's just competitive batting practice of course, but there's nothing wrong with dreaming on some laser beam home runs from Cespedes the rest of the way this season.