The 60-day disabled list -- or "DL" -- is the longest of the three disabled lists in Major League Baseball. Players placed on the 60-day DL must remain on the DL for a minimum of 60 days and are temporarily removed from a club's 40-man roster, which often makes the list a last resort for clubs.
If a club doesn't need a 40-man roster spot to replace an injured player, the player may be kept on the 10-day DL longer than 60 days rather than being transferred to the 60-day DL. That way, the club won't need to risk losing another player by going through the process to clear a spot on the 40-man roster when the injured player is ready to return. Under the 2017-21 Collective Bargaining Agreement, the 10-day DL replaced the 15-day DL as the shortest DL option for non-concussion injuries.
In April 2017, the Cincinnati Reds claimed Tyler Goeddel off waivers from the Philadelphia Phillies. In order to clear a spot for Goeddel on the 40-man roster, the Reds transferred Anthony DeSclafani from the 10-day DL to the 60-day DL. The Reds subsequently optioned Goeddel to Triple-A Louisville.