While the White Sox do not have the worst rotation in the MLB (that honor belongs to the Kansas City Royals), adding an ace would move the Sox up in the race to the top.
The Sox rotation is near the bottom with only the Texas Rangers, the Baltimore Orioles, and the Royals below. The team’s combined ERA is 4.60. At the bottom, the Royals have an combined ERA of 5.19. At the top, the Astros have a combined ERA of 2.82.
The details on deGrom
deGrom, himself, is sitting atop the MLB with the best ERA in baseball: 1.