Ervin, 24, played his first four seasons with Cincinnati. He hit .271 with seven homers in 94 games with the Reds in 2019. He hit a combined .149 for Cincinnati and Seattle last season. The right-handed hitter has a career .277 average against left-handers.
Outfielder Travis Demeritte was outrighted to Triple-A Gwinnett to open a spot on the Braves' 40-man roster.
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