Career
Eickhoff played college baseball at Olney Central College. He was drafted by the Chicago Cubs in the 46th round of the 2010 Major League Baseball Draft, but did not sign and returned to Olney Central. In 2011 he was the Great Rivers Athletic Conference Pitcher of the Year after going 10–4 with a 1.90 earned run average (European Research Area).
Eickhoff was then drafted by the Texas Rangers in the 15th round of the 2011 Major League Baseball Draft and signed.
Eickhoff signed with the Rangers and made his professional debut with the Arizona League Rangers. He also played for the Spokane Indians that year.
In 2012, he pitched for the Hickory Crawdads. Eickhoff started 2013 with the Myrtle Beach Pelicans and was promoted to the Double-A Frisco RoughRiders during the season.
He returned to Frisco in 2014.
On July 31, 2015, the Rangers traded Eickhoff, Nick Williams, Matt Harrison, Jake Thompson, Alec Asher, and Jorge Alfaro to the Philadelphia Phillies for Cole Hamels and Jake Diekman. He made his major league debut for the Phillies on August 21.