Williams ended up missing just over a month of action with a side strain. Before going on the injured list on May 17, the 27-year-old Williams pitched to a matching 3.33 ERA/3.33 FIP with 7.0 K/9, 1.67 BB/9 and .67 HR/9 in 54 innings. Williams, Joe Musgrove and the currently injured pair of Jordan Lyles and Jameson Taillon have been the Pirates’ most productive starters this season. Lyles, out since June 10 with left hamstring tightness, will make a minor league rehab start Sunday, Adam Berry of MLB.com tweets.
Pittsburgh turned to Keller, 23, in hopes the premier prospect would help provide answers for an injury-laden rotation. Instead, Keller has allowed 14 earned runs on 21 hits and six walks through 12 innings and three starts thus far. But Keller was fairly effective in a loss to Detroit on Tuesday, when he yielded two earned runs (four total) on four hits and two walks in five innings, and has already notched 15 strikeouts in his big league career.