David Phelps is a former Major League Baseball pitcher who played for several teams during his career. He was born on October 9, 1986, in St. Louis, Missouri, and attended Notre Dame High School in Cape Girardeau, Missouri. Phelps went on to play college baseball at the University of Notre Dame, where he was a standout pitcher.

Phelps was drafted by the New York Yankees in the 14th round of the 2008 MLB draft. He made his Major League debut with the Yankees in 2012 and spent three seasons with the team. During his time with the Yankees, Phelps was primarily used as a relief pitcher, but he also made some starts. He had a solid rookie season in 2012, posting a 3.34 ERA in 33 games. In 2013, he appeared in 22 games and had a 4.98 ERA. In 2014, he made 17 starts and had a 4.38 ERA.

In December 2014, Phelps was traded to the Miami Marlins as part of a five-player deal. He spent two seasons with the Marlins, primarily as a starter. In 2015, he made 23 starts and had a 4.50 ERA. In 2016, he made 24 starts and had a 2.28 ERA before suffering a season-ending injury in August.

In July 2017, Phelps was traded to the Seattle Mariners. He appeared in 10 games for the Mariners before suffering a season-ending injury in August. He underwent Tommy John surgery and missed the entire 2018 season.

In January 2019, Phelps signed a one-year contract with the Toronto Blue Jays. He appeared in 17 games for the Blue Jays before being traded to the Chicago Cubs in July. He finished the season with the Cubs, appearing in 24 games and posting a 3.18 ERA.

In January 2020, Phelps signed a one-year contract with the Milwaukee Brewers. He appeared in 12 games for the Brewers before being traded to the Philadelphia Phillies in August. He finished the season with the Phillies, appearing in 10 games and posting a 2.77 ERA.

Phelps became a free agent after the 2020 season and signed a one-year contract with the Toronto Blue Jays in February 2021. He appeared in 15 games for the Blue Jays before being traded to the Chicago Cubs in July. He finished the season with the Cubs, appearing in 16 games and posting a 6.53 ERA.

Phelps announced his retirement from baseball in November 2021. Over his career, he appeared in 289 games and had a 3.86 ERA. He was primarily used as a relief pitcher but also made some starts.