The Rays reinstated Mesa (hamstring) from the 10-day injured list Tuesday.
The 24-year-old has been sidelined since Aug. 18 due to a strained left hamstring, but he's ready to rejoin the active roster after going 4-for-18 with two homers during a five-game rehab assignment. Mesa and Jonny DeLuca could operate as a platoon in right field, with Mesa holding the advantage for playing time as a left-handed hitter.