Thomas Kevin Layne (born November 2, 1984 in St. Louis, MO) is a former professional baseball pitcher. He previously pitched for the San Diego Padres, Boston Red Sox, and New York Yankees of Major League Baseball.

In 2007, Layne was named an All-American and Carolinas-Virginia Athletic Conference Baseball Pitcher of the Year for the Mount Olive College Trojans. The Arizona Diamondbacks drafted Layne in the 26th round of the 2007 MLB Draft.

Layne progressed steadily up the minor league ladder over five seasons in the Diamondbacks' system and was promoted to the Triple-A Reno Aces in early 2011. The San Diego Padres acquired Layne from the Diamondbacks on May 3, 2012, for cash considerations. Layne was noted as having a "rubber arm" and he enjoyed having the chance to pitch every day, so he welcomed the transition to a reliever role.

The Padres promoted him to the major leagues on August 14 2012. He made his Major League debut the same night against the Atlanta Braves, striking out the side in his one inning. Layne remained with the Padres for the rest of 2012, working out of the bullpen. He didn't allow a run in his first 11 appearances. Tommy earned his first win as a Major Leaguer on September 4 when he struck out Adrián González, Matt Kemp, and Hanley Ramírez in order in the 10th inning.

He picked up his first major league save for the San Diego Padres on August 22, 2012, completing a 4-2 win over the Pittsburgh Pirates for Andrew Werner, who earned his first major league victory in that game. He finished the season with a 3.24 ERA and 25 strike-outs versus 3 walks in 26 appearances.

Tommy Layne signed a minor league deal with the Boston Red Sox on November 10, 2013. He was called up for the night game of a day-night doubleheader against the Baltimore Orioles on July 5, 2014.

In 2016, Tommy pitched to a 3.77 ERA in 34 games for the Red Sox. After they acquired Fernando Abad at the trade deadline, the Red Sox designated Layne for assignment on August 2 and released him on August 6. He then appeared in 48 games for the Yankees in 2016 and 2017.

(excerpted from Baseball Almanac, BR Bullpen & Wikipedia)