Mesa Solar Sox
After Washington lost the 2017 NLDS to the Chicago Cubs in five games, Robles played in the Arizona Fall League during the fall of 2017. In 13 games with the Mesa Solar Sox, he went 10-for-41 (.244), had a .389 on-base percentage, hit three home runs and a double, drove in seven runs, and stole seven bases. Playing for the East team, he was named the Most Valuable Player of the league's Fall Stars Game after going 1-for-3 with a walk, driving in a run, and scoring two runs in the game.