Williams and the Guardians won't face the Pirates on Friday, as the game was postponed due to poor air quality.
The game will be made up as part of a split doubleheader Saturday, with Williams taking the mound for Game 1, per Tim Stebbins of MLB.com. Williams went 10-4 with a 3.81 ERA, 1.15 WHIP and 134:37 K:BB across 113.1 innings prior to the All-Star break.