With Matusz in Triple-A, Zach Britton and Jake Arrieta on the disabled list and Brad Bergesen, Jim Johnson and Jason Berken in the bullpen, the Orioles have no homegrown pitchers in their current rotation for the first time in more than two years.
With Chris Tillman's outing on Thursday (which lasted just 2 2/3 innings), the Orioles continued a string of seven straight games started by pitchers they did not draft: Tommy Hunter (2), Tillman (2) and one each by Alfredo Simon, Jeremy Guthrie and Jo-Jo Reyes.
According to the Elias Sports Bureau, it is the longest such streak for the Orioles since the beginning of the 2009 season, when the club had 13 games started by pitchers they didn't draft – Guthrie, Simon, Koji Uehara, Mark Hendrickson and Adam Eaton – before Bergesen started Game No. 14.
Of the five pitchers to start during the current streak, Guthrie and Reyes were obtained through waivers, Tillman and Hunter were acquired in a trades and Simon was signed as a free agent out of the Mexican League.