15-day Injured List
As part of the 2017-21 Collective Bargaining Agreement, the 10-day injured list replaced the 15-day injured list as the shortest option for non-concussion injuries.
MLB was set to bring back the 15-day injured list specifically for pitchers and two-way players (position players who are eligible to pitch in any circumstance) while instituting new restrictions on position players pitching for the 2020 season, but the rules were changed amid the COVID-19 pandemic.
Rather than a 10-day injured list for position players and 15-day injured list for pitchers and two-way players, the 10-day injured list remained in place for all players in the shortened season, and there were no restrictions on position players pitching. There was also a separate COVID-19 injured list that had no minimum duration, and the 60-day injured list was reduced to 45 days.