Bernadina, who turned 30 last week, has hit .153/.286/.203 in 71 plate appearances for Cincinnati this year. The Reds signed him to a minor league deal in January. The outfielder has a career .236/.306/.352 line in parts of seven seasons with the Nationals, Phillies and Reds.
Contreras, 23, has not pitched above Double-A Pensacola, but he’s gotten good results there, posting a 2.70 ERA with 12.2 K/9 and 5.0 BB/9 in 20 innings this season. MLB.com ranks him as the Reds’ No. 5 prospect.