David Hernandez is a former Major League Baseball pitcher who played for several teams during his career. He was born on May 13, 1985, in Sacramento, California, and attended Elk Grove High School. Hernandez was drafted by the Baltimore Orioles in the 16th round of the 2005 MLB draft and made his debut with the team in 2009.

Hernandez spent four seasons with the Orioles, primarily as a relief pitcher. He had a 4.16 ERA and 9.2 strikeouts per nine innings during his time with the team. In 2013, he was traded to the Arizona Diamondbacks, where he spent three seasons. Hernandez had a 4.37 ERA and 9.9 strikeouts per nine innings with the Diamondbacks.

After his time with the Diamondbacks, Hernandez played for several teams over the next few years. He spent the 2016 season with the Philadelphia Phillies, where he had a 3.84 ERA and 9.9 strikeouts per nine innings. In 2017, he played for the Los Angeles Angels and had a 2.23 ERA and 10.0 strikeouts per nine innings.

Hernandez signed with the Cincinnati Reds for the 2018 season and had a 2.53 ERA and 9.9 strikeouts per nine innings. He then signed with the Arizona Diamondbacks for the 2019 season, where he had a 4.94 ERA and 9.9 strikeouts per nine innings.

Overall, Hernandez had a solid career as a relief pitcher in the MLB. He had a career ERA of 4.12 and 9.6 strikeouts per nine innings. He played for several teams over the course of his career and was known for his ability to strike out batters. Hernandez retired from baseball in 2020.