The theme for the Pittsburgh Pirates starting rotation has been inconsistency and flat out mediocrity. Jameson Taillon has lost basically the entirety of the 2019 season and now the 2020 season due to Tommy John surgery, Chris Archer has struggled with command, efficiency, and the long ball, and Trevor Williams has struggled to get outs. Joe Musgrove has been the most consistent pitcher in this rotation, but has struggled mightily in the later innings.
It appears that the 2020 starting rotation will most likely include Musgrove, Archer, Keller, and Williams.