An unsigned player under club control who has accrued at least three but less than six years of MLB Service Time is automatically eligible for salary arbitration. Also, any unsigned player with at least two years but less than three years of MLB Service Time who accrued at least 86 days of MLB Service Time the previous season can qualify for salary arbitration as a so-called "Super Two" if the player is among the top 22% in MLB Service Time of players in that group.
The "Super Two" cut-off for 2018 (post-2017) is 2+123 (two years plus 123 days) MLB Service Time.