Bour was optioned to Triple-A Salt Lake on Wednesday.

Bour will head back to the minors to free up a roster spot for Luke Bard, who was summoned from the minors in a corresponding move. The slugger showed some improvements at the plate during his most recent stint with the big club (.227/.271/.545 in 15 games), though he's still slashing just .183/.269/.387 on the season (160 plate appearances).

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