Mesa Solar Sox
Prior to the 2013 season, Skole was ranked as the Nationals fourth-best prospect by "Baseball America". However, Skole collided with a runner on a fielding play at first base in the second game of his 2013 campaign with the Class-AA Harrisburg Senators, falling to the ground and tearing his ulnar collateral ligament and flexor tendon in his left elbow. He underwent Tommy John surgery on April 17, 2013, taking him out of action for the season. Skole returned to action and played in the Nationals' instructional league in September and then against high minor league talent for the Mesa Solar Sox in the Arizona Fall League.