Diaz was optioned to Triple-A Jacksonville on Friday.

Diaz started just one game during his most recent stint with the major-league club, and he'll now return to the minors after Garrett Cooper (back) was reinstated from the 10-day injured list Friday. Diaz has appeared in 28 games with Triple-A Jacksonville this year and has hit .236 with seven home runs, 22 runs and 18 RBI.

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