Sampson was drafted by the San Diego Padres in the fourth round of the 2009 Major League Baseball Draft. In 2010, he went 12–3 with a 2.90 earned run average and 143 strikeouts in 118 innings pitched. He started the 2013 with the Triple-A Tucson Padres but was demoted to Double-A San Antonio Missions after posting an 8.03 ERA. He was promoted back to Triple-A on August 7, 2013 after going 10–4 with a 2.26 ERA in Double-A. He was added to the Padres 40-man roster on November 20, 2013. Sampson was designated for assignment on December 29, 2014.\n', '

On January 8, 2015, he was claimed off waivers by the Cincinnati Reds. The Reds promoted Sampson to the major leagues on July 30. He was designated for assignment on April 20, 2016, when they called up Drew Hayes. Sampsons Contract was Purchased by the Reds, when the Reds placed Homer Bailey on the 60 Day DL May 18, 2016. On November 28, 2016, Sampson was designated for assignment. He was non-tendered on December 2.\n', '

On December 17, 2016, Sampson signed a minor league contract with the Arizona Diamondbacks that included an invitation to spring training. He was released on June 15, 2017.\n', '

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