He played in Major League Baseball (MLB) for the Cincinnati Reds and Baltimore Orioles.

He was called up to MLB on September 2, 2009, after was 2–2 with a 5.47 ERA and converted eight of 11 save chances for the Triple-A Louisville Bats.

[2] Viola made his MLB debut with the Reds on September 8 at Coors Field against the Colorado Rockies, pitching in the sixth and seventh innings in relief of starter Matt Maloney.

After joining the Orioles he spent most of his time in Double AA Bowie but has been called up on 2 occasions.

In 2013, he signed a minor league contract with the Oakland Athletics and pitched for the AAA Sacramento River Cats He was selected to the Dominican Republic national baseball team at the 2009 World Baseball Classic, 2019 Pan American Games Qualifier[6] and 2019 Pan American Games.